it can be anything with CoA sticker, or a license book...and it must be able to boot to windows at the store, if a laptop, no damage screen..
I trade in an old 1.2ghz/40gb notebook with no keyboard, it is a 6 years old, off brand bought from frys.com. 2 years ago, I took the keyboard out because my son spill juice on it, so I just tape a piece paper on top to cover the empty space, they turn it on, see it boot to windows, check the CoA sticker, no problem..