Hello, members of MR! I first used search function before I posted this since not all of the questions that I wanted to ask were addressed. Hopefully this thread can be helpful to other members as well. The situation that I am in is that I need to sell my older macs on eBay now that I've upgraded to MBP. I have only sold 1 product on eBay and that was worth $20 or so. Naturally I am little nervous about selling my macs that are worth quite a bit on eBay. In order to mitigate any risks, I would like to be prepared. I appologize in advance since these questions are basic and elemantary : 1) I've registered all of my macs. If a potential buyer requests serial number do I provide it? If I don't provide it, doesn't it appear that I am a scammer? 2) When the transaction is complete on eBay, do I need to send an e-mail to Apple that I no longer own this product and re-register it to the new owner's name? 3) To delete sensitive information, do you prep it up by reinstalling OS? I may have more questions as I go through this process. Thank you in advance for all your help!