i contacted xbox live for assistance with my halo 2 keys telling me they have been activated too many times, and im the only one that uses thoes games, i have 2 keys for 2 separate halo 2 games, and get the same message with both, weird concidering, i had just opend the 1 box, contacted MS game support and without a resolution, and directed me to this site, looks like MS have stolen from me again, well ive washed my hands of there products i dont need the aggrevation
How long ago did you buy the games and where did you get them from? Finding a brand new copy with an unused key today would be very rare indeed, it’s possible that you maybe have a 2nd hand copy? Or perhaps whoever sold you the copy took a note of the keys beforehand. Sucks, but it’s been known to happen 