Hello all, I am in the works of purchasing an AppleTV second generation (so he claims) off Craigslist and before I purchase it, I want to be able to confirm 100% that its a second and not third generation. The seller doesn't have the box anymore, only power cord and ATV unit. From the looks I believe the 2 and 3 are identical, but what features/serial numbers/anything should I look for when I'm checking it out later today. I'm visiting him in an hour so quick answer(s) would be most appreciated. Thank you!