another middle man trying to wash her hands.

once you obtained any partial gain in monetary of the transaction therefore you are bound to the completion of the sales.

the oversea seller does not deal direct with the buyer as such he or she does not know what information that you had given to the buyer. it is between you as a middle man to the buyer.

and you ASSUME and you ASSURED the buyer that it is authentic therefore you are providing the information that you are selling an authentic item.

and it is not the buyer role to liaise with your supplier as he purchased the item thru you.

seller aka middle man is at fault.