I'm selling it on ebay, but there are some questions I have about transferring AppleCare+ to the new owner. The website states "Attach the required agreement number, proof of purchase, and serial numbers, as indicated previously." What's the agreement number? I also don't have the receipt since I bought it online and can't find the email with the order confirmation anymore, but it's under my name anyway so not sure what else is really needed as an alternative. Do I also need to provide them with the information of the new owner?