Here is what I found out that you may know or not. In 1870-75 they lived in Elma, NY.
4th of June 1880 census they moved and were living in Buffalo, NY in the 1st ward; page 36, SD 11, ED 112
1900 nothing showed up therefore it would be unlikely they were buried in Elma having moved to Buffalo, NY in 1880.
I also check FAG and nothing showed up. I would check with the Cheektowaga Cemetery group governing Mt. Calvary, Buffalo old cemetery, German and French cemetery etc..