Careful buyiing one online buddy. ALOT of them age very quickly (in color). If you are into the yellowed eggshell look, make sure its evenly aged. I have seen some with very patchy yellows and it looks wrong!
Also, make sure you get lots of pics of the back and neck. The rubbish paint Gibson puts on the guitars don't dry properlyu and SOAKS up the black case's colour, forming black Patches on the body. I bought one CHEAP as hell because it had this problem( I shave the neck anyways...).