Also, since you are a Micro$oft customer with a valid license, you could call them and tell them your situation. They probably will help.
I was surprised when they actually gave me the CD-KEY over the phone when I explained that I wanted to move my FrontPage off an older computer and put it on a newer computer. I just had to prove that I had a license (since I registered the software after buying it, that was easy).
They might actually give you the CD-KEY over the phone if you tell them you can't wait for the box version.
Go to their website and call them. They actually answer the phone. 