According to an article in the Suburban Journals web site, all in attendance also tried the same thing. Bob Kilzer, of Maryville, was probably the most successful. He was able to walk around the grounds and find some unmarked graves. By poking the rod down a few inches, he was able to find the headstone that had fallen years before and been covered with dirt and grass.
You can see a picture of Shirley Daiber showing Bob Kilzer how to use copper wires to "witch" for graves at http://suburbanjournals.stltoday.com/articles/2010/06/14/madison/life/0616cvj-witching.txt