Have you tried contacting this organization? It's responsible for all matters concerning deceased Wehrmacht personnel and maintains scores and scores of cemeteries full of German military war dead worldwide.
Graves information (especially helpful for obtaining a few details on non-officer personnel):
Gräbernachweis des Volksbundes
Deutsche Kriegsgräberfürsorge e.V.http://www.volksbund.de/graebersuche/content_suche.asp
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