Hi Everyone....I just bought my first MBP. Unfortunately I couldn't afford to buy new so I waited for a long time to find a good deal on Craigslist. I'm new to Mac's so I looked up all the things to look for and I checked the Serial # on "About this Mac" against the apple database and everything checked out. I played around with the Mac for 45 minutes....everything worked great. I've had it for a few days now and again everything is running great and I've edited a few video projects on it. Guy said he was a Graphic Designer and was upgrading to a new iMac. He conveniently forgot his ID, all he had was his business cards. All in all with the time spent testing the machine and everything checking out online I wasn't too worried I guess. My issue is that I kept feeling I got "too good" of a deal so I went back on Craigslist past few days and each time I see a new ad from same guy selling a different MBP. Today I read some forums and they mentioned the serial # on the bottom of the MBP....which I didn't know was there due to me being an Apple noob. What I found was that the Serial # there and the "About this Mac" don't match. When I run the new Serial # through the database it still shows the same specs, just a few months earlier build date and still shows warranty (it's a 2012). Based on the fact this guy is clearly selling these machines on Craigslist (not just one to upgrade his like he said) and the serial #'s don't match...what should I be concluding? Is it stolen? Is it fake? Refurbished by himself?? As mentioned it works great as far as I can tell....haven't seen any issues in the few days I've had it and I've used it for a number of hours now. Sorry for the long winded post. Hope you can help. Thanks.