on that Mingus Mosaic box, the new 1964 items, with dolphy in the group, are
Town Hall Concert April 4, 1964
1-2 Sophisticated Lady 5:49
2-5 Peggy's Blue Skylight 19:13
2-6 Parkerania, Part One 6:38
2-7 Parkerania, Part Two 8:57
2-4 Fables Of Faubus 11:06
another good one is
https://adale.org/Discographies/LateED.html
the known unissued europe items with dolphy are below, but they may have been issued in the past few years.
April 14 Copenhagen
Parkeriana 24:48
April 18th (aka 19th) Théâtre des Champs-Elysées, Paris
I Can't Get Started fm broadcast 8 minutes
and this 2004 verve release is the first to have the real 'so long eric' 22 minutes from
April 18th (aka 19th) Théâtre des Champs-Elysées, Paris
https://www.discogs.com/release/3874828-Charles-Mingus-The-Great-Concert-Of-Charles-Mingus
other releases had an edited version of 'so long eric' from 17th Salle Wagram paris.