I have been to a cemetery off Wynell Rd. in Callands where several Collins are buried. There are inscribed stones for Augustin Collins, Christie Oakes Collins, Calvin Collins, Laney Collins, Luttie Mae Collins, Mary Oakes, w/o Z. C. Collins and Zelphni Calvin Collins.
The stones, some hand-inscribed, are scattered over a wide area in woods. I saw nothing that may have been Hiram Collins, but he could have been there with a field stone. The ground had a heavy covering of leaves and underbrush. There was no stone for Brice Collins who died during the war.
GPS coordinates for this cemetery are: 36.84815, -79.58448