So I was all ready to purchase the 13 inch mbpr from bestbuy with the 10% coupon and $50 edu coupon. Saw an ad for a brand new 13 inch on CL for $900. Guy claims it was a graduation gift and he didn't want it. My questions: -any way I can check it was not stolen? -any problems registering with apple for warranty? -does apple require store receipt for warranty claims? -any gotchas with this deal? I am saving about $114 from the bestbuy deal. Thanks for any input.