When I got Poser 7 the serial was on was a sticker on the DVD sleve.  Did you perhaps return the DVD to the wrong sleeve?

It does note on the download page that Mac users need to reenter the serial number after SR3 installation.

I would have thought if you registered it they would have your serial on file...

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"Oh - the manual says that? I have never read the manual - this must be why."
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