I FOUND the ELUSIVE RATTLE.
Its not the seat. Its actually the retractable seat belt mechanism that sits inside the interior wall. When nobody is sitting in the passenger seat, the seat belt is fully retracted and whatever mechanism is inside the wall of the interior has no tension on it and wobbles/rattles inside there. So for the moment I am just buckeling up the empty seat. But I may take that wall piece apart to see if I can see why the retractable mechanism is rattling around.
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