Interior plastic rattling, where?!

I've got a 96 hatch and it sounds like the back right plastic speaker trim cover is rattling. It sounds like it's plastic to plastic rubbing, not tapping, but I can't seem to find it. I've taken it off and put small adhesive backed felt pads all over where plastic meets plastic, and it still won't go away.

It's really annoying around 2500 +- 500 rpms. Anyone finding the same rattles?

Sorry about the aggravating Q's tonight...but the girlfriend is out of town on a bacheleurette party!!! MUST KEEP MIND OCCUPIED, MUST KEEP MIND OCCUPIED!!!