There are only 164 boxes and 166 recordings, this sounds like a copy or Reel 143. This is a studio recording, sounds like Frank Frost possibly with Ry Cooder. Frost rehearses several songs multiple times, sometimes back-to-back. The recording opens with a beeping noise and has several silent gaps between songs.
Labeled as a recording from the Lena testimonial/benefit concert. This is a studio recording, sounds like Frank Frost possibly with Ry Cooder. He is rehearsing songs; some are repeated and some second times through a song are not included on the recording. Not all the songs are originals of Frost. There are silent gaps between the songs of varying length, the longest lasts a few minutes.