Buffalo as a place of death would be correct as the family lived in that area on & off thru the years.
Maybe a post for a death/obit look up on the both of them will tell what town they were born in & perhaps their parents (I can hope!).
I was able to find on Family Search the marriage of James & Sarah i Van Buren, Mich. James age 23 born Indiana married on April 13, 1872 to Sarah A. Jackson age 18.
I also found a "possible" birth for Jame A. born March 9, 1873 in Casco, Van Buren, Mich.
Also on Family Search I found a death record for James T. as May 7, 1935 aged 56. Shoot! I didn't note the place/state of death! But as you stated it was Buffalo & that makes sense. I will do a search for Sarah & see if i can find a death date for her as well. Omce I have that info, I can then perhaps post a query for an obituary.