Dr. William L. Larkin and Eliza Larkin were my 3rd grandparents.  As you know they were buried in the Warner cemetery.  The other known grave that is not marked is their son, John Larkin, who died in 1883 (before Furneaux was developed).  John Larkin was buried at Warner cemetery with plans to be moved later when his wife, Mary Ann Wilburn Larkin, died in 1886.  Mary is buried in Furneaux Cemetery.  John's children planned to move him when Mary died but for some reason did not.  Later the family place a huge marker for both at Furneaux cemetery as well one for their son, Robert, who died in 1885.   

Hope that fills that unmarked spot in Warner Cemetery

Sincerely,  Fran