I'm looking to get a good used MBP 2010 model. I've inquired on a few on eBay as well as Craigslist. As soon as I ask for the serial number to cross reference with the Apple Store to verify warranty, specs, etc. I do not hear back from the seller. Is asking for the serial number a no-no? To me, it seems like a good idea but I can understand how somebody could be put off by it. If this is out of line, what questions should I ask to protect myself by confirming the product is not stolen and nothing crazy is going on? Ideally, I would like to pick up a 2010 MBP 15" or 17" for around $1,200 and have some extra cash for an SSD and RAM upgrade. Meh, may end up going with a new MBP from Apple Online.