Hi Jerry,
This is what information I have...David and Susan graves, also with two more that cannot be read, are located 4 miles n/e of present day Aldrich Post office. The cemetery is located atop of a small hill, in small trees, abt. 1/4 mile from road.

And this...Coffman Cemetery: Including genealogy information, located 2 miles northeast of Aldrich, Polk County, Missouri, Union Township, section 23, Township 33, Range 24
Coordinates to cemetery..N37.47069 W93.27669

I think it's going to take some looking for the cemetery, may be grown over now, not sure. That is great that you found someone that is willing to go look, let's hope he likes to hike! Let me know when and if you find out anything.

There is also a book that is no longer available that was written my a Jenne Stringer, "Coffman Cemetery: Including genealogy information, located 2 miles northeast of Aldrich, Polk County, Missouri, Union Township, section 23, Township 33, Range 24" that is in only three libraries as well as the LDS Church in Salt Lake. Google it and you can see, I would love to take a look at that, suppose to have pictures. Please stay in touch, maybe between the two of us, we can FIND something!
I hope this might help find the cemetery. PLEASE let me know
Thanks
Jerry Coffman