Finding registration code

Hello,

I had purchased the spore game (mac version) about 3 years ago and have installed it to my IMac, so far I have enjoyed playing it. I have now received a new MacBook Pro sadly instead of a PC, but am still happy about it. I have lost the CD registration key and have not been able to find it but still have the CD, the package itself, and the old IMac where it was installed on before with the CD registration code given. Is there any possible way to get into a file of spore in the IMac that says the registration code that was used 3 years ago?

Thanks