It's been quite a while now but IIRC they didn't actually have the Brandenburg photos posted anywhere at the time. I was just poking around the root directory and saw them listed in a folder somewhere. They might have them posted publicly now, I haven't checked.
Anyway, yeah, there are boxes full of survey photos, film, slides, documents, news clippings, interviews, etc. It's hard to say
exactly what they have since many of the labels are so generic, but here's an inventory of their holdings:
https://legacy.lib.utexas.edu/taro/ttusw/00271/tsw-00271.html
It's like a treasure hoard for severe weather nerds. As you'd imagine, there's a bunch of stuff from decades' worth of events. Incidentally, I believe all (or at least most) of the survey photos from 5/31/85 are stored there, too.