I have received the IDPF file for Sylvan Feld. It is 173 pages long. I posted it on my Google drive. See post #3 above for the link. It is an interesting read.
Basically, Feld's body was taken in the German ambulance across the Seine by barge. The body was buried in Monumental Cemetery in Rouen, grave 1043 as an unknown German soldier. In 1959 the Germans were recovering bodies and came across Feld, who still had his dog tag. Buttons from the clothing in the grave also indicated an American body. American authorities were notified and the body was positively identified in Frankfurt using dental records. See pages 143 and following in the IDPF.
Grave Today:
https://www.findagrave.com/memorial/...23/sylvan-feld