Ok this is more than a bit unusual. According to the support documentation at Apple, the latest version of iWork ‘09 does not come with any serial numbers when purchased in store.
Hmmm… Why would Apple do this?

In designing the new interface for Nitro-LM Administrator, I’ve had the pleasure of designing the new Report Builder interface. In the current production version of this tool, we have a handful of reports that licensees and customers can use to see various aspects of usage data.

We never thought we would ever see this in a licensed commercial software product, but here it is…