Is my cd-key a legit one?

[potissimus]

That was my other concern.

For all I know, he could be sitting at home with a backed up cd of the one he sold me with the legit key on the cdcase, feeding me a lie and giving me a non-legit one using a "I lost the case" lie.

So does anyone know if there are defining characteristics of legit cdkeys so I can check?