Hi Gerard, just noticed your post. I'm surprised the lack of posts given Milltown's history. I grew up in Andersons Town (Park South) overlooking Milltown. Quite a few of my relatives are interned there. Can't say as I can answer your question but Milltown was renowned for it's paupers graves back in the day.
I believed the plot was in some bog land within the cemetery and stories of coffins coming up out of the ground and floating on the surface were quite common.