Archive.org now has a page with "the raw analog waveform and the reconstructed digital tape image (analog.tap), read at the Computer History Museum's Shustek Research Archives on 19 December 2025 by Al Kossow using a modified tape reader and analyzed with Len Shustek's readtape tool." A Berlin-based...
Tape image: https://archive.org/details/utah_unix_v4_raw
Extracted filesystem: http://squoze.net/UNIX/v4/README