ebay fraud

i purchased an item from an ebay seller and paid by money order.i have received the item and in condition as descibed.now i have been contacted by a 3rd party that says it was puchased frauduantly with fake credit card.they request item sent back to them.ive givin them the ebay sellers name and address and have contacted ebay about this.since then the ebayer has been unregistered by ebay and of course the 3rd party can not locate him.what are my legal liabilities?am i responsible even though i payed for item?any advised would be helpfull thank you

Normally no--not if you paid a seller in good faith. You can wait till the police become involved and they will investigate the seller.