if you ordered online they will e-mail the code to you

well if you ordered from gamestop that is

 

from gamestop.com:

Reserve Halo Wars and receive a pre-order card to download a special in-game Warthog vehicle with flame decals. Offer valid while supplies last.

Online Customers: Code and instructions will be emailed one day prior to the game’s shipping date.

In-Store Pickup / Store Customers: Pre-order card with code and instructions will be provided at time of game pick-up.

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