They now know what happened to him. He did not get far, and killed himself when he was about to be captured.
He wasn’t identified till many years later.
If you are talking about Marin Borman, yes his body was found in Berlin but it was years after the war, the area that the body was found in was search a number of times early and the body was not found.
Credible reports exist that Borman actually made it to Argentina and his body was transported back to Berlin after he died.
Borman never making it out of Berlin is likely what happened, I say a 95% percent chance, the 5% chance that he actually made it to Argentina still exists.