I'll be putting this here since this is the only Apollon-related entry to the CD Theater Dragon Quest releases. I'm fairly certain there are several re-branded releases of the Enix counterpart. Just as shown on the pictures from @
jfgslo these had an additional sticker on the backside. I was able to track down another one for proof which is CD Theater Dragon Quest III. And there I can spot the Apollon logo. Unfortunately the resolution is too low to spot anything else
My guess is the Theater Dragon Quest I + III releases with the additional sticker also carry a APCG-number, since they have been most likely (partially?) distributed by Apollon. I wouldn't even be surprised if the Theater CDs for Dragon Quest IV were still related to Apollon as Apollon released the original/orchestra soundtrack for DQIV too. I'll dig deeper into this when I find the time
EDIT: proof found, Dragon Quest III (
ECD-003~4) is APCG-9005
