The Hardin County Courthouse burned in 1884 and then again in 1921, www.state.il.us/court/circuitcourt/circuitmap/2nd.asp
. You can contact them about what records survived from 1874. Hopefully they'll have his will/probate and land sale records.
I did a Google search for Lee Cemetery but didn't find anything. It's probably abandoned. The Hardin County Historical & Genealogical Society
PO Box 72
Elizabethtown, IL 62931
might have additional information about it.