lost gamestop receipt, don't have dlc or loc armor

i lost the receipt cleaning out my room to make room for my halo xbox and the statues
i bought a halo xbox in addition to the 250 halo game
i lost my receipt and i was wondering what to do in order to get a code for the loc armor and for the dlc
i don’t want to know that i shelled out nearly $1000 for this halo 5
just to lose the dlc and loc armor

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