After Moe Asch revived the old “Asch Recordings” label as a brand, two of the missing outakes appear, remastered obviously, on a 1967 LP. So the Smithsonian should have them now… somewhere. Bold type added:

“1, 2 BURL IVES, voice and guitar Poor Wayfaring Stranger
The World War II musical, "This Is The Army, " catapulted Burl Ives to fame but it was Alan Lomax, working with Burl in the studio while Moe recorded Asch 345 in the control room, who helped him for-get singing lessons and Broadway parts and get back to the traditional style he'd never altogether left, that he'd grown up with in Jasper County, Illinois. "It was very nice the way they worked together," Moe recalled. Only a cough and a hesitation kept this warmly sung version of Burl's famous theme from being issued in the 1940' s. You couldn't edit acetate. In 1966 such editing was possible once one had transferred the performance to tape, as was done in this instance....

"1,3 BURL IVES, voice and guitar The Bold Soldier (Alt. Master, A -345)”
[Smith, Charles Edward, Liner Notes FW00AA3, Asch 1939-1945 Vol. 2, Folkways Records, Asch AA3, 1939-1945 Vol. 2, 1967, LP, trks. 1.2, 1.3]
[Folkways-FW00AA3pdf]