I bought a Macbook Air 2011 13 on eBay for 1075.00. I got it yesterday and it has a strange issue. When I click about this Mac it says it's an i5 with 1.7 GHz, with Thunderbolt. But the case does not have the thunderbolt insignia. The keyboard is bulging out and a couple of screws are missing from the bottom. The macbook air is running super slow. The seller wants me to send it back for a refund. He assures me that he will refund my money.