As I said Israel publishes all its dead and if his body was captured that would be a HUGE story. For example every Israeli knows name of Ron Arad - a pilot who was lost over Lebanon 30 years ago.
Israel admits all 3 jets shot down by Saiful Azam in 1967, so why would it hide that one? And if Israel wanted to deny being shot in the air so much we could say that jet was shot down from the ground or had technical failure.
P.S. Israeli pilots have a wing badge on uniform not that star of david + ranks on shoulders.