For what it is worth, here is his obit:
https://www.legacy.com/obituaries/na...?pid=178804416
"....he flew 13 reconnaissance missions before his P38 was shot over Berchtesgarden and he escaped by parachute before his plane crashed in the Austrian Alps. He was taken prisoner on March 26, marched to Stalag 7A and liberated on April 29."
MACR is here:
https://catalog.archives.gov/id/91141284
I think the MACR has messed up the location last seen. It has 47 10 E, 11 25 N probably should be 47 10 N, 11 25 E. Note even the "corrected" last seen location is not really close to Berchtesgarden.
He did an interview for the Veteran's History Project:
http://memory.loc.gov/diglib/vhp/bib...c2001001.75108
but it appears the interview is kept at the Richard I Bong Heritage Center:
https://bongcenter.org/
You can try to contact them.