Lost Dragon Age: Origins Awakening disc and key

Hello all,

A very long time ago (pre Origin client) I had pre-ordered DA: O and the Awakening expansion. They were on separate discs as at the time Awakening did not come with Origins. I have had Awakening for a very long time until I recently moved and now I cannot find it and, it just so happens that I cannot find the product key to it either because it was in the case with the game disc and is lost. I have had it registered with the BSN when I previously bought it.  I would very much like to play it again as the Dragon Age series is one of my all-time fave games. Do I need to buy another copy or is there a way?