[Question] Activation key

I bought Red Orchestra: Ostfront 41-45 recently from a second hand store without realizing that the key was already used. In retrospect, I should have probably thought that purchase through better. :(



The store, sadly, does not except returns, and having been terribly excited to play, I was wondering if there was something that could be done since I did pay for this.



If not, however, that is perfectly understandable, too. Its my own fault for neglecting that detail before I bought this game from a second-hand store.