By official description, do you mean the in-game text that comes up when you examine the music box (or highlight it in your inventory)? I don’t have any save-game files where I could check that at the moment, but if that’s what you’re after, you should be able to find it in the text dump I did for TWotA’s Dialogue section a while back. As far as I can remember, the only stuff unlocked in PDS by a PDZ save file is the Aronak Unit and extra cash at the start of the game, so there shouldn’t be anything else you’re missing.
Arcie, I have a relatively recent save file for Panzer Dragoon Saga, some time after I obtained the Aronak unit on a recent play through. If you still don’t have the information, I can load up the game in a litte bit and tell you the description for the item (as according to the game), and whatever else you need. Of course, this is assuming that the battery for my Saturn hasn’t died recently, but it should be fine.
I’m pretty sure the only things unlocked by the Zwei file are, as it was said, extra Dyne (100 or so per hour Zwei gameplay hour, I think?) and the ability to obtain the Aronak unit.