Well, I started using the links at Dreamerzoid's site to look at stuff on the Wayback Machine, and one of the links led to Freedom Reborn Handbook. I've saved most of the pages, and started on the data pages. One of them was for a character called Outamyhead, and I was curious enough to click on the link to the skin... and it was there! Not only was I there, it was on a Wayback Machine saved NPI page with other links to other skins... and other NPI pages. I think I got them all (at least the ones that were still there), there were some 250 skins and/or meshes. I know I have some of them already (they were at NPI), and I haven't checked them all out, but I figure I have a couple that I didn't before.
All in all a very profitable waste of time.