Hi Anon,
I set up some WikiTree profiles for Maxwell and Mildred.
Maxwell passed away in 1995, Mildred in 2003, and their son Charlie in 2012. All three are buried in Maple Grove Cemetery in Chesterville, Ohio. Both Mildred and Charlie have obituaries online, and their funerals were handled by Snyder Funerals in Mount Gilead, Ohio, so it is likely that Maxwell's funeral was planned there, too. You may want to contact Snyder's to see if they can point you in the direction of an obituary for him.
If you are interested, please join us here at WikiTree. We'd love to have your Boggs research, and to get updated on Maxwell when you find something :)