This has also been my experience. Oftentimes the additional pages are repetitive with the others, but not always. I use it often enough that it would be worth taking notes to supplement the
index. As a practical matter, though, I've just accepted that there is a lot of manual searching involved. (I've scanned through every single page multiple times since it first appeared, just "brute forcing" any possible matches.)
In most cases, the processed binders seem to have been relatively
complete at including all the specimens --
for those Crawford numbers that are in them. I don't think they've added any
types to the Processed Binders since I started using them. But additional
types have been indexed in SITNAM (and/or CRRO).
That said -- I really love that resource. I've found quite a few of my
Republican Denarii in there with new photos/provenance info (and many that I've researched for bidding but lost, and a couple I've sold), and have learned about some new & interesting
collections and sales that I wouldn't have otherwise known about.
Here's a collage of a few favorite finds (including the
Quinctia Hercules/Rat
Denarius that I foolishly sold in 2012):