I recently purchase a bunch of 2nd hand games which included Xcom enemy unknown. When i started the install on steam i relised the code needed to register the game was missing, as was the instruction manual. I contacted the buyer but as per his description games were sold as seen. All other games have the code. Is there anyway of getting the codes needed to install the game, i have original discs and cases and have the DVD code which is one both discs, or have i basically pooped out of luck on this one ???