My concern is (and please tell me if I am wrong, because I would love to know otherwise) that for INAD dispute the seller has to send the buyer a return postage coupon, and you can't do that for an overseas sale.  (The one International  INAD  I had I just refunded in full without asking for the item back, because I couldn't see a way to do this. I had gone through all the steps of asking the buyer what I could do to make them feel happier - ie partial refund, but they demanded refund in full.)