So I've read through the rear sub rattle thread and pinpointed my rattle. It's coming from the small white "latch" that is positioned right above the trunk light. It has just enough gap to make a horrible racket with almost any amount of bass being played.
Now in the TSB I got on the issue shows fixing that problem by putting some wool between the latch and the metal it rests against. In all my attempts to get any kind of fabric in there to pad the area I have so far had no success so I'm looking for direction on how to remove the whole assembly and then pad the area and be done with it.