CS2 & CS3 Upgrade I have my backup's but my key is missing!!?

I can not find the originals CS2 and CS3 3 discs upgrades. I have all my software and stored on copies, but I have no copy of the key. I do not even know if it is possible, but can I buy a new or used without key buy all of the follow again?

Thanks for your help, I am willing to pay for a key. I just need to get CS loaded on my wife for the new Macbook x-mas.