Leendert, do you have access to the fold3 USN War Diaries ?
If not I can search them for you.
Edited: I was curious so search any way.
By the way, the documents on fold3 don't give the serial, and disagree on the number of casualtiers (one say crew + 9 passengers, another 17 passengers) but give a narrative of the flight from the point of view of the other pilots (three transports planes were flying together before being scattered by a storm).
This webpage is listing 13 casualties for this loss (with a typo on Sparboe name), 4 crew and 9 US Navy passengers:
https://missingmarines.com/2012/08/0...hur-b-barrows/
These same 13 men are commemorated on the Honolulu Memorial on the date of 17 August 1943 (one year and one day after going missing, the usual norm for US memorials). They are the only ones commemorated here for this date, so my conclusion would be that the document saying there were 17 passengers is probably wrong.