Ebay Buyer scam beware Internet

I just sold iphone 5 on ebay and I check and double check before carefully shipping it out. THe buyer later report the phone does not powered on. He quoted imei to me in the email with raise my suspicion. I figure if the internal were swap then surely there is no way I can verify if the returned phone was indeed mine imei # or not. Call Ebay, she told me ebay does not protect buyer from fraudulent return. What the f***, you protected the buyer by refunding the money back but if I some how could confirmed that the phone was indeed not mine, I can't do a d**n thing. That is the last time I will be using ebay to sell my stuff. Curses them, they will if my pray are answer going out of business in two years. Mark my word!!!! PS: This is not the first time either, something similar happen in almost the same way. Seller need protection too!!