John, I have many updates for your last list. Corrections are absolutely welcome, but I tried to be thorough.
UNIQUE TO NAXOS
Biamonti 48 Anglaise for piano in G minor (original and revised versions) [Naxos 34]
Biamonti 345 Fuga Tema in C [Naxos 34]
Biamonti 346 Fuga Antique in C [Naxos 34]
Hess 25 Finale. Allegro early version of String trio op.3 VI [Naxos 46]
Hess 87 March in B flat WoO 29 arr for piano (original and revised versions) [Naxos 34]
Hess 89 Ritterballett for piano [Naxos 33]
Hess 90 Creatures of Prometheus for piano [Naxos 33]
Hess 91 Opferlied, 2nd setting for voice, choir and piano [Naxos 88]
Hess 93 Freudvoll und leidvoll, elaborated version with prelude [Naxos 88]
Hess 94 Freudvoll und leidvoll, elaborated version without prelude [Naxos 88]
Hess 95 Freudvoll und leidvoll, for voice and piano [Naxos 88]
Hess 99 March in F arranged for piano [Naxos 33]
Hess 100 10 German Dances for piano arrangement of WoO 8 [Naxos 15]
Hess 101 12 Minuets for piano, arrangement of WoO 7 [Naxos 17]
Hess 102 Piano version of 7 dances from Contredanses WoO 14 [Naxos 16]
Hess 118 Invisible chorus for Consecration of the House, Folge dem mächtigen Ruf der Ehre! [Naxos 72] Music is the same as a piece in Ruins of Athens, but different lyrics.
Hess 137 Liebe (Ich wiege dich in meinem Arm/Ich Schwinge dich in meinem Dom) [Naxos 88]
Hess 140 2 alternate versions of Dimmi, ben mio, che m'ami, op.82/1 [Naxos 88]
Hess 141 Alternate version of Busslied, op.48/6 [Naxos 88]
Hess 142 1st version of Wonne der Wehmut, op.83/1 [Naxos 88]
Hess 144 1st version of Feuerfarb, op.52/2 [Naxos 88]
Hess 145 Sketch of 1st setting of Opferlied, WoO 126 [Naxos 88]
Hess 146 1st version of Der Freie Mann [Naxos 88]
Hess 151 Traute Henriette [Naxos 88]
Hess 178 Alternate version of Sunshine WoO 153/44 [Naxos 84]
Hess 191 The Vale of Clwyd, 1st version of WoO 155/19 [Naxos 84]
Hess 194 I dream'd I lay, 1st version [Naxos 84]
Hess 195 When far from the home, alternate version of WoO 153/40 [Naxos 84]
Hess 196 I'll praise the saints, 1st version of WoO 153/41 [Naxos 84]
Hess 197 'Tis but in vain, 1st version [Naxos 84]
Hess 198 Oh! Would I were 1st version of WoO 153/48 [Naxos 84]
Hess 200 The Maid of Isla 1st version op.108/4 [Naxos 84]
Hess 200 The Maid of Isla 2nd version op.108/4 [Naxos 84]
Hess 201 Bonnie Laddie, Highland Laddie, 1st version of op.108/7 with original violin part [Naxos 84]
Hess 201 Bonnie Laddie, Highland Laddie, 2nd version of op.108/7 with revised violin part [Naxos 84]
Hess 202 Oh! Thou art the lad of my heart, Willie 1st version of op.108/11 [Naxos 84]
Hess 203 Faithfu' Johnie, 1st version of op.108/20 [Naxos 84]
Hess 204 O let the night my blushes hide discarded version WoO 155/7 [Naxos 84]
Hess 205 The Dream, 1st version of WoO 155/14 [Naxos 84]
Hess 206 To the Blackbird, 1st version WoO 155/20 [Naxos 84]
Hess 263 Te solo adoro, sketch for WoO 186 [Naxos 90]
Hess 264 Te solo adoro, sketch for WoO 186 [Naxos 90]
Hess 274 Canon in G actually by Johann Mattheson, from Der vollkommene Kapellmeister III/15 [Naxos 34]
Hess 297 Adagio in A flat for 3 horns [Naxos 60]
Hess 324 Melody in C minor for piano [Naxos 34]
Hess 324 Melody in C minor for piano reconstructed by A.W. Holsbergen [Naxos 34]
Hess 325 Piano piece in D [Naxos 34]
Hess 330 March in C minor for piano reconstructed by A.W. Holsbergen [Naxos 32]
op. 41 Serenade for flute in D, arrangement of Serenade op.25 [Naxos 64]
op.64 Cello sonata arrangement of string trio op.3 [Naxos 36]
op.121b Opferlied, 1822 version for 3 voices, choir and orchestra [Naxos 76]
op.122 Bundeslied for chorus and piano [Naxos 77]
op.131 Early version of 1st movement of String quartet #14 in C sharp minor [Naxos 54]
WoO 2a Piano version of Triumphal March from Tarpeja (spurious) [Naxos 33]
WoO 10 6 Minuets, reconstructed for orchestra [Naxos 8]
WoO 15 6 Ländler for 2 violins and bass [Naxos 59]
WoO 17 11 Mödlinger Dances (spurious) [Naxos 7]
WoO 18 - original (1810) and revised (1822) versions of March #1 F [Naxos 59]
WoO 19 Original (1810) version of March #2 F [Naxos 59]
WoO 23 Ecossaise in G for Piano [Naxos 17]
WoO 27 3 Duets [Naxos 60, but for flute and bassoon instead of clarinet and bassoon]
WoO 63 revised version of 9 Variations on a March by Dressler [Naxos 29]
WoO 99/3 (E pur fra le tempeste Hess 232) [Naxos 90]
WoO 99/11a (revised version of duet Fra tutte le pene, no separate Hess #) [Naxos 90]
WoO 99/11b (revised version of terzet Fra tutte le pene, Hess 209) [Naxos 90]
WoO 99/12a (solo voice version of Salvo tu voui lo sposo, no separate Hess #) [Naxos 90]
WoO 105 First version of Hochzeitslied, with 2 solo voices, Hess 125 [Naxos 87]
WoO 113 First version of Klage [Naxos 88]
WoO 133 First (1806) version of In questa tomba oscura [Naxos 88]
WoO 135 First version of Die laute Klage [Naxos 88]
WoO 140 Draft version and first version of An die Geliebte [both Naxos 87]
WoO 160 Two canons [Naxos 63]
WoO 171 Glück fehl' dir vor allem (by Michael Haydn MH 582) [Naxos 90]
WoO 222 Canon in A flat Hess 275/328 [Naxos 34]
UNIQUE TO DG
Hess 76 Cadenza for Piano Concerto #1 [DG 20]
Hess 133 Das liebe Kätzchen [DG 84]
Hess 134 Der Knabe auf dem Berge [DG 84]
op.58 Piano quintet version of Piano Concerto #4 [DG 118]
op.75/5 First version of An den fernen Geliebten [DG 88]
WoO 18 arrangement by Schade of March in F as Yorck'scher Marsch [DG 25]
WoO 64 Harp version of 6 Variations on a Swiss Song [DG 51]
Note that uncatalogued Kafka folio 47v: Allegretto in A minor/major for piano [DG 99] should be listed as folio 47v 11-16; it is a longer version of the same piece on Naxos 34, described there as Presto in A, Kafka f.47 13-16.
COMMON TO BOTH DG AND NAXOS
Needs to be moved here: Biamonti 213/Unv 12; in addition to DG 99, it also appears on Naxos 34, so not unique to DG and should move to this category.
Biamonti 425 Symphony #2 in D op.36, version for piano trio [DG 118, Naxos 41]
Hess 245 Fugue in D minor for string quartet fragment appears on both [DG 101 and Naxos 63]
op.121b Opferlied, 1824 version for solo voice, choir and orchestra [DG 93, Naxos 76]
op.122 Bundeslied for chorus and orchestra [DG 93, Naxos 75]
WoO 99 Partsongs: 21 of the 25 songs are in common [DG 85, Naxos 90]
HIDDEN (unindexed) ITEMS
WoO 2b Introduction to Act II of 1805 version of Leonore [Naxos 7] is included in the Gardiner Leonore [CD 28]
op.72a Leonore Overture #2 [DG 102] is used as the overture to the 1805 Leonore by Blomstedt [Naxos 69]
BOTH SETS MISSING (major catalogued items only)
Hess 1, Original ending to 8th Symphony, first movement
Hess 12, Oboe concerto (lost other than 2nd movement, reconstructions)
Hess 15, Piano Concerto in D (1815), 1st movement reconstruction
Hess 47, Piano trio arrangement of string trio op.3 (1st movement and fragment of 2nd movement)
Hess 82, Cadenza 'senza misura' for Rondo of Piano Concerto #4
Hess 83, Very brief cadenza for Rondo of Piano Concerto #4
Hess 92, Bundeslied for solo voice and piano
Hess 95, Freudvoll und Leidvoll in F (draft)
Hess 108, Siegessymphonie from Wellington's Victory op.91, arranged for Panharmonicon (but no Panharmonicons are extant, so this would be difficult)
Hess 110, Leonore 1806 version; Gardiner on DG incorporates some elements from it [DG 28-29]
Hess 111 Early version of Nur hurtig fort from Leonore
Hess 112 1806 version of Rocco's gold aria, cut from the 1806 Leonore
Hess 113 Marzelline's Aria with abbreviated conclusion
Hess 114 Recitative for Don Fernando, Dresden version of Fidelio [this may be silently included in the Gardiner version on DG 29]
Hess 121 Aria of Marzelline O wär ich schon mit dir vereint in C
Hess 122 Another version of Aria Hess 121
Hess 147 first version (fragmentary) of Der Kuss, op.128
Hess 149 Rastlöse Liebe (drafts)
Hess 150 Heidenröslein (drafts)
Hess 233 Counterpoint exercises for Haydn
Hess 234 Exercises in strict counterpoint for Albrechtsberger
Hess 235 Exercises in free counterpoint for Albrechstberger
Hess 236 Remainder of 2-voice fugues
Hess 237 Remainder of 3-voice fugues
Hess 238 Remainder of 4-voice fugues
Hess 239 1 of the 3 Chorale Fugues
Hess 240 2-voice exercises in Double counterpoint of the octave
Hess 241 Exercises in Double counterpoint of the octave and a third
Hess 242 Exercises in Double counterpoint of the octave and a fifth
Hess 243 Remainder of double fugues
Hess 245 Musical Joke for 3 voices, Sankt Petrus ist ein Fels
Hess 246 Double fugue on Kyrie eleison
Hess 298 Draft of Symphony Movement in C minor
Hess 299 Bester Magistrat
Hess 300 Canon Liebe mich, werter Weissenbach
Hess 301 Waehner, es ist kein Wahn
Hess 302 Canon, Uns geht es kannabalisch wohl als wie fünfhundert Säuen
Hess 304 Canon, Ich blase das Fagot
Hess 305 Canon Geschalgen ist der Feind
Hess 321 Little instrumental melody in B-flat
Hess 322 Gott allein ist unser Herr, er allein
Hess 323 Leb wohl, schöne Abendsonne
Hess 326 Fugue in C (sketch)
Hess 327 Two little melodies in A minor
Hess 329 Beginning of Tibi gratulor
op.11 Piano trio in B flat, version for violin in place of clarinet
op.42 Nocturne for viola (doubtful)
op.63 Piano Trio (doubtful)
op.68 Alternate ending to Pastoral Symphony, II (Scene by the brook)
op.105 Violin version of 6 variations on folksongs
op.107 Parts of violin version of 10 variations on folksongs
WoO 205 Musical Greetings
WoO 223 Canon, Thut auf (Biamonti 752)
WoO 224 Canon, Cacatum non est pictum
WoO 225 Canon, Grossen Dank für solche Gnade (Hess 303)
WoO 226 Canon, Fettlümerl und Bankert haben triumphirt (Hess 260)
WoO 228 Musical greetings: "Ah, Tobias" and "Tobias" (Hess 285)
Unv 5 Concertante in D (full score fragment of the beginning)
Unv 20 Lamentations of Jeremiah
Biamonti 15 Musical Joke, Der arme Componist
I have to say, when we started The Unheard Beethoven just about 20 years ago I never imagined we would get to the point where the list of unrecorded Beethoven was this short; other than the counterpoint exercises (which I will be the first to admit are not that interesting unless you are really into counterpoint) it's mostly things that were never completed or variants, so if you live in a Small Beethoven world (how sad!) you could consider these boxes to be pretty much the Complete Works between them. And some of the others have appeared on other recordings (the 1806 Leonore, the WoO 205 Musical Greetings, Hess 15 Piano Concerto, Hess 12 Oboe Concerto, etc. See The Seldom Heard Beethoven pages at
http://unheardbeethoven.org for details), trimming the list down even further. This is a case where I welcome becoming redundant. But there are still quite a few unpublished sketchbooks that include things not yet published or heard, so we're not done yet!
Mark