Hi I lose the box with the 25 characters product key how I can activate the game?

I bought long ago an AGE OF MYTHOLOGY, but unfortunately I lose the box with the 25 characters product key to activate the game, how I can do it.

… so I post it in Age of Empires forums instead the Age of Mythology forums, because yes.

If you still have the original CD, you may try contacting Microsoft Games, or some Microsoft Games admin in Age of Mythology forums. If you lost both box and CD, I’m sorry, you will have to buy it again (in this case, you have the Extended Edition in Steam).