Clues to his identity

They also found ration stamps that were redeemable at the Aalborg air base, a military installation, which was captured by the Germans from the Danish military in 1940. It what was credited to be one of the world’s first invasions by paratroopers.

The book

There were other stuff found in the wreckage with the pilot’s remains. One of those found still tucked in the pocket of the pilot was a book. It remained uncertain what the book was. They didn’t bother examining it because it was too delicate.