The sound is generally acceptable. They are probably air checks. There are no liner notes, just photos from other sessions. Most of the musicians in the first two dates are unidentified (perhaps local musicians). The Birdland date features Bud, Mingus, Art Taylor and Candido on congas. On the last date, he’s sitting in with the Chet Baker Quartet
See https://www.discogs.com/master/1151100-Charlie-Parker-The-Bird-You-Never-Heard