Hello, I recently sold a cell phone, the charger, and 3 spare batteries on ebay. The buyer waited 5 days after it was delivered and emailed me this morning telling me the only item in the box when they received it was 1 battery. They said everything else was missing. The buyer also opened a case on ebay and they are requesting a full refund! I know I sent ALL of the items via Priority shipping with USPS. If I issue the refund they get a free cell phone, the charger, and 2 batteries for free! So what can I do about this???