I don't have any actual information for you, but I do have a suggestion. In checking Peter Robinson's card in the PA Archives ARIAS Card Index to the PA Volunteers, I learned that his residence was Johnstown, PA. Perhaps if you contact the

Cambria County Historical Society
615 N. Center St.
Ebensburg, PA 15931-1122
(814) 472-6674
www.cambriacountyhistorical.com/

they may be able to determine if he is buried in the Johnstown area.

Hope this helps.