Whitey Bulger used to cut off the hands and pull the teeth of some of his victims, many former female lovers, to prevent their bodies from being identified. He buried some on the seaside nearer to Boston, but dumping a body on the Cape isn’t out of the question. There are no tolls or other barriers driving from Boston to the Cape, and the shoreline is nearly deserted off-season.
Bulger “frequented” P-Town bars often and was in the area that summer.
I believe the two female victims of Whitey were actually girlfriends of his partner Steven Flemmi who Whitey thought knew too much.