I am about to buy a new, opened box macbook pro retina from ebay. The seller told me that it's a month old, and still under 1 year limited warranty. I planned to buy applecare later. Seller told me i could use the paypal receipt as a proof for purchase when i buy an applecare. Is it right? Can i do it? P.S. i talked with apple on online chat. They said, i cant use the receipt that is not from authorized reseller to purchase the applecare. IM SO CONFUSED!