Cannot get rid of unwanted trunks

I accidentally bought trunks from the cascadier. Now i cant sell it, convert it, or even discard it. What the hell Square?

It sounds like it's a "special" item then, so you could try sticking it in the Armoire in the inn room, it might let you put it in there (so at least it's out of the way/not taking up any inventory space?). Sorry that I can't test, but I don't have my vouchers to get those yet!