Sims 3 Late Night Lost Serial Code

I recently had to replace my Mac as my old one broke without warning I have all of my serial numbers for every expansion pack and the Sims, but i've no serial number for my Late NIght! I cannot go onto the old computer because it was taken by the insurance company so I cannot redeem the code from there, what can I do! 

P.s I regestered the game on the sims3 website, I just don't know how to redeem my serial no. from there?