<< ah diablo 2 item...
it probably disappeared because it was a dupe so now he wants his money back... who knows? >>
^^ hmm, this is very possible.
did you dupe the item in the first place?
if you did, that is a no-no and thats very wrong trying to make money off of that item.
if you didnt, and possibly got the item from someone else and then sold it, it could have possibly been a duped item that disappeared.
so try to talk with the person you sold the item to and ask him what happend.
to be honest, your SOL with paypal.