my black ops 2 didn't come with a steam CD key but is asking me to activate on Steam, please help me

Black Ops II PC

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I bought Call of Duty Black Ops II and i put Disc 1 into my PC and it said, type in your Steam CD Key to activate this game, but it didnt come with one. Please may someone help me get around this message?

CSSxReCoiiLz
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