Have you tried checking online cemetery records? If he was moved to a new grave that was marked, you might well be able to find the grave that way. Depends when he was moved, since different cemeteries have been surveyed at different times. It’s worth a try though, if you haven’t already. All my relatives who are buried in a small town cemetery in Iowa, beginning in the late 1800s through to the spring of 2000 are findable that way.
I don’t know if this site includes all available online records, but it’s pretty extensive. http://www.accessgenealogy.com/cemetery/search.htm
Thanks for the link. I'll try it.