Bluenoser, those loss records (MACR) are sometimes as accurate as a fortune teller's predictions
They go from last known location. I had a MACR that said, lost near Landshut, but the P-51 came down 200km away at Nuernberg.
Venlo to Bruggen in a P-51 is less then 5 minutes flight!
To answer your question, yes, the Allies would not have interest in recovering his wreckage, they never did on the Continent, that I know of. The Germans would have salvaged it for raw materials. In 2003 I recovered the P-47 of MAJ Chester Slingerland, he is buried in France. I found over 4000 lbs of wreckage and that was after the Germans had salvaged as much as they could. Besides, if the P-51 impacted with the cockpit down, the armor plate could have gone in quite a bit. Also, it was made of steel, which was of limited interest. They wanted aluminum! According to my friend, the site where the armor plate was found was from a very shallow impact crash, not a dive.
Danny