If I got money to splash on a 11k item ..... why not just + a few k more for a totally new one?

You either ask him sell then pay you, or refuse to take the item. There is a reason why he past you an item instead of cash ..... either the card is stolen or bought from black market, or he is trading speculation.

Just like pokemon cards, I borrow 1k from you, buy a bunch of packs to open, then pay you back with a few cards that stack up to 1k in price list.