Thank you for your help. They're all just MOVBxxxx, like MOVB0001.jpg, MOVB0002.jpg, etc. The name of the creator is MovieFan. A summary text file from newsgroup a.b.p.e.b has a header of
[email protected], but that's a dead end. That post was from 2007. It looks like the host for that post was supernews. and at that point the collection went up to MOVB3438.jpg. Each jpg was 900z600, up to around 1600x900 in later posts with 4 panels that were screen caps from the movie that the jpg was the topic about, some with a title bar in the image, later ones without labeling or framing. There were/are two sister series, tvbxxxxx which were television screen caps and xmovb, screen caps from adult films.
I found a few of the pictures posted here:
https://xhamster.com/photos/gallery/movb-1-10-14609025Thank you for helping!