bringing this forward. Not sure who gets original credit but it has been very helpful to me in discerning the lay of the land.
you can see that the route from the vacant apt/crime scene is wooded and would give ready access to the dumpster, followed by RB's apt. building.
I think you are onto something WOO, I thinik he carried her little body along the wooded route to where the dumpster was and then went on his merry way home, all completely unseen via the back/patio door, which he left unlocked for access later for cleanup but then due to the heavy police presence never got up the nerve to go back and do.