Where he was buried isn't in www.findagrave.com
, Ancestry or FamilySearch.
If you know the date of when he died, you can look for his newspaper death notice.
if you know the town in which he died, you can do a Google search for the name of their historical society who often has inventories of cemeteries.
The Long Island Genealogy Society, www.longislandgenealogy.com/
might be able to help you.
If he was buried without a tombstone, you probably won't find where he was buried. Sad but true. Successful Searching!