I bought Dragon Age II and Dragon Age Origins from the Xbox Live Marketplace and downloaded them, how do I get a registration key?

Hello friends,

I went through the proper support channels, and could not find anyone that knew what I was talking about, so though I would try here.

I own an Xbox 360, and purchased DAO and DA II from the marketplace, as digital downloads. As such, I have no hard copy of the games, and no registration key to register them on the forums and such.
From reading on the forums, it seems this is a common problem.

Could you guys help me out with this?

Thanks so much 🙂