Purchased an '03 SSM TL-S couple of weeks ago and with 30 miles on the ODO a rattle started in the dash. Tried all the thread suggestions and finally took it to Sunnyvale Acura on Wednesday. They say it was the equalizer (hidden by Bose stereo bezel) bracket that was rubbing against something in the dash.

The rattle was constant over most roads, but would stop if I pressed the front of the stereo or along the side of the popout tray.

So far so good, the rattle is gone (knock on fake wood)