The Setup program installed all of it's content to my C:Program FilesCurious LabsPoser 5 directory and those PZ3's do NOT exist there.

They do however exist in the external Poser 5 directory I setup on my external drive with the downloaded Poser 5 Content they made available to Poser 6 users from E-Frontier. It's certainly not on the hero CD which is the only other content that I installed in that external directory.