I want to upgrade to ipad 2 and i just sold ipad 1 on eBay, the guy said before he paid if i would include the receipt with the ipad just in case something goes wrong with it he can take it back to Apple, as it is under the one year warranty, i said sure ill ship the ipad with the original receipt...but now im thinking, you don't need a receipt to exchange a defective ipad because it has a serial number, Apple can just look it up...so why does he "really" want the receipt? Haven't shipped it yet and he paid my paypal account...any ideas?