Ok guys, here is my problem:

I recently sold an iPhone 5 on ebay. The buyer lives in Ukraine. He paid for USPS first class international. I shipped it the same day he paid for it. August 11th, the package left from the US. He opened a case on the 18th asking for a full refund. I have $482 invested in this. How fair is it that he's gonna file a open case on me for items not recieved? Ebay said if the tracking isn't updated 10 days after it was last scanned then he could win the dispute. I already shipped the item to this guy. Please help.