IWork '08 serial number?

My friend let me use her iWork '08 CD to install it on my computer, and it installed fine, but when I went to use the programs, it asked for the serial number, it says it was in the 'Installing iWork '08' booklet. I only have the 'Getting Started' booklet, is it in there??
Update: I already asked her, and she didn't know about it...
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