The 14th Squadron of the 7th Photo Group USAF used Spit MK XIs until early April 1945. They were ordered to return their remaining Spits to the RAF within a week on March 29, 1945. As far as I know the last spitfire pilot from the 7th PRG to become a POW was the CO Robert J Dixon who was downed by flak at Merseburg on February 14, 1945. He remained a POW until the war ended and eventually became a 4 star general and head of the Tactical Air Command. I think you can pretty much exclude the 7th PRG from the downed American Spitfire pilots who were released before the war's end.
All the best
Scott Blyth