I think this behaviour is "intended": RC3 is the 3rd release
candidate for 9.1-RELEASE. The candidate already reflects the
correct access path for the binary installs via pkg_add.
This path _will be_ correct as soon as 9.1 has been released.
But as it it's not _yet_, the files are not present at the
designated location.
As 9.1-RC3 is "on the path" of 9-STABLE, your approach of
accessing the STABLE-related access path looks valid.
--
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...