I used to offer return on items i sold on ebay until a buyer basically screwed me with the return policy. After he had said item for 12 days he asked for a refund. When I talked to him on the phone, his reasoning was that he couldnt sell the item for more money so he wanted to return it. I had no recourse as ebay 99.999% of the time favors the buyer.
You should have no problem winning out as the buyer.