Cobretti, you are kidding yourself!
Steve never had possession of a card that he gave to G as collateral!
Ok! I understand that i think!
ok looks like i need to expand for you.
Steve gave card to G as collateral for unpaid goods. Therefore no longer in possession as G now owns it till Steve pays him back.
Steve tried to sell something that wasn't his any more to Bolli (ie not in Steve's possession)