My cousin, Jack Beierle, sent me a letter, dated 1995, with a map of the "Eliot Burial Ground" cemetery location in Roxbury, Massachusetts (now within Boston city limits). The cemetery is on the northeast corner of Washington and Eustis Streets:
" Take (3) south, take exit 18 "Roxbury." After exit, bear to the left avoiding Mass. ave. and following sign to "Melnea Cass Blvd." Turn left on Harrison (light, left turn lane). Turn right at next corner on Eustis. Turn right on Washington going north - you will find legal parking on the right (two-three spaces). To arrange to have the cemetery unlocked, call Elizabeth Shepard at (617) 635-4505, extension 6516. There's voice mail and she's most likely to be at her desk mid-afternoon."
Here are the two photos that Jack took and shared with me: