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I played on and before that day but never knew if I get a code for it or not.
Halo 4
Did you check your email? That's how they sent the codes.
Steam - slamt4sticLive - SLAMt4stic
they sent codes to your xbox live account. log in and check your messages on the xbox.[Edited on 12.15.2012 5:25 PM PST]