The grocery store receipts... OMG, this new info personally blew me away!!!
In our discussions of why perp would dismember the body, my mind went to all the "usual" reasons, of course.
Given that the last thing perp wants to happen is to be stopped by LE w/the body in his car, I came up w/this scenario: Dismember body and, perhaps, place in deep freezer; on day of disposal, go to grocery store and buy couple of bags of groceries making sure to keep receipt(s); place body parts in garbage bags and place in bottom of the new grocery bags and cover w/groceries; keep store receipt(s) handy.
Gads... is this a possibility?!?