It depends if his remains were claimed by a funeral home that was hired by his family. That's one option.
The other and more likely is that he was buried on their grounds. Unfortunately there are about 1500 unmarked graves on this property. There is a web site about this, https://inmatesofwillard.com/2013/09/22/1864-wyoming-county-...
. This was not an uncommon practice.
Sometimes where a person was buried will be in their obituary if there was one and on their death certificate. Successful Searching!