Hi,
Surprisingly, the earliest incident of the capture of a shot-down Me 262 pilot I could find was on 21 April 1945 when the pilot in Me 262 A-1a W.Nr. 501221 'yellow 3' was shot down by U.S. ground troops near Kloetze.
That would make the defection of test-pilot Hans Fay in the newly-built, unpainted Me 262 A-1a W.Nr. 111711 from Schwabisch-Hall to Rhein-Main on 31 March 1945 the earliest chance for the Allies to debrief a Me 262 pilot. Below is the summary of Hans Fey's [sic] debriefing.
http://www.zenoswarbirdvideos.com/Im...LOTDEBRIEF.pdf
However, I am hoping that a member has an example of an earlier capture.
P.S. I have just found a source that says Ofw. Helmut Buchner somehow escaped "uncaptured" on 21 April. My mistake.
Jim