You can check the American War Dead Database on the Net. It is listing only 40% of the American dead, those still buried overseas, buried at sea during the war or missing (by the way, those entered as missing in the DB and recovered since are still in the base with the comment 'remains recovered'. Both case I know were buried in Arlington).
The site is
http://www.abmc.gov/searchww.htm.
As I said, the date may be right, or be one day and one year after the MIA date, or just be after the war when authorities concluded the man was dead, but date and place was unknown (this is the case with people known to be captured that then disappeared).
For your man, the site gave:
Eldon E. Coulson
Second Lieutenant, U.S. Army Air Forces
Service # O-715478
95th Fighter Squadron, 82nd Fighter Group
Entered the Service from: Kansas
Died: 8-Nov-45
Missing in Action or Buried at Sea
Tablets of the Missing at Sicily-Rome American Cemetery
Nettuno, Italy Awards: Air Medal with 2 Oak Leaf Clusters
And that was my source to say he was missing. Also the death date in 1945, exactly one year and a day after the loss date of the MACR, strongly suggests a MIA case.
As for identifying its possible target, I think it can be any single-engine fighters. It if really attacked the P-38s, that are hard to mistake with anything else, it should be German, not US or RAF&Co. Then a Bf109 is more probable than a Fw190.