uStore 17.2, uProduce 13.1.1, AIS CC-2024.
Mmm...?!
Until now, I have been unable to reproduce the behavior from an NG, SPA Store:
All Refresh Previews or Proofs, regardless the uProduce docs are INDD or XLIM, regardless the uStore Products are SPA or Legacy, do not show the Crop Box (they show the Art Box only), as I expected.
Enjoy your tests
here with a mix of 4 products, that feature the 4 possible combinations.
From InDesign CC-2024, my doc looks like this:
All the 4 High-res PDF production files have Crox Boxes (see attached).
Maybe I'm missing something? (or maybe I simply misunderstood what your problem is?)