Yeah I saw a post about this issue.The noise might be coming from the very rear of the car, where the glass meets the plastic above where the rear speakers are. The Loveland, CO SC fixed my rattle by working in the area. On the outside of the car, push on car above where the spoiler is located and the glass...and see if it make any noise.
When I press outside no sounds. Pretty solid.
Also I adjusted 4 stoppers for rear hatch long time ago, they were completely off and hatch was bouncing and making other headache issues. But that is solved.