Hello !
I have cd-key for game CS:GO for one lucky person.
History: 3 Years ago I got some cd-keys from Intel for buying a CPU. I used almost every except this one, becasuse I already had this game on steam library. So I keep this cd-key in my email till this day.
I'm not sure, if this code is expired ( like it had some period of time to be activated); or it is region restricted
Steam says, that I already have this game when I trying to activate this cd-key, so there are chance to still working
GL !