If you have xbox I believe that Nuketown 2025 is now free for everyone so the codes may have been deactivated. if you go to the in-game store you should be able to download it for free. Go to multiplayer, then store, and then look for Nuketown 2025. If it is not there then maybe when you update the game it installs for free. Either way, I am almost positive it is now free.
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