No MACR because nobody was missing.
No accident card because it was not an accident.
Good luck to find the serial.
https://www.fold3.com/memorial/65780...303181#stories has the same story for his loss than findagrave, but provides more for his life and service before.
http://www.usaafdata.com/ has an entry for him on 19 September 1944, so I wonder if this loss occurs during the night of 19-20 or 20-21. See
http://www.usaafdata.com/?q=node/186158
As the B-24 took off from RAF Leuchars according to the narrative, maybe there is something on the ORB of the RAF station.