I see some deals here and there on craigslist or ebay, brand new. I'm considering buying one, and I checked the serial # on apple.com and it pulls up as a legit ipad. Is there anything i have to worry about? It shows there is not exact purchase date. Anything that can happen if i log in with my normal apple ID? What are the chances somebody got it from it falling off the truck? Any repercussions?