Was I disappointed!

I had information that my third great grandfather, Samuel Munson had died in the cholera plague of 1833 and was buried in the Millersburg Cemetery in Millersburg, Kentucky. In fact one source said that his grave was in a forty foot square fenced area with the graves of other Munsons. I walked all over the cemetery with no luck.  I bent over many a gravestone. I have an appreciation now of how the face of a gravestone can weather away in 150 years. I am trying to find someone who can help me find his grave. The sign says 1860 but my great grandfather was buried in 1833. He must have been buried in an older cemetery.