I recently bought crysis 2 from the flea market, I saw a game vendor was selling used games, one of them was crysis 2 for PC, im very new to pc gaming and have no idea what a (product code is). All i received was the disk and limited edition code. Apparently this code is in the game manual, But i didn't notice when i bought it the game manual wasn't in the case, i didn't know PC games came with one. What should i do, i cant play single player or multi player because it says i need to activate it. Is there a universal code or something? I cant take it back because the guy has left, and i cant sell it without a serial key can I? PLEASE HELP

well if u cant find the serial key then ur pretty much **** up... try to see it inside the case bellow or beyond the cd side....

Its not in an original case, unless the cases look like dvd cases and the cover is some printd out paper with the title