Is it possible to register Dragon Age 2 If I bought it from the Xbox live marketplace?

I recently purchased Dragon Age 2 from the "Games on Demand" section of Xbox Live, and after playing a bit, i remembered that I could get bonus items for doing specific things outside the game, I went to the site and one of the first ones i saw was to register my game. I figured that it would be easy enough, I got on my account yada yada yada, but then it told me to input the code that would be "inside the box". Well, its pretty hard to get the code from the box when you didn't get the box. So i was wondering if there was just some crazy obvious way to register that i haven't seen so far, or if its impossible to register since i bought it off the marketplace, Any and all help would be appreciated.Is it possible to register Dragon Age 2 If I bought it from the Xbox live marketplace?
Yes

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