It can be very hard to find a rattle like that visually. Often if I am working alone, I'll place a cellphone recording video of the area I want to see or to reach into an area that I can't easily get my eyes.
If you can get it to rattle while slowly revving the engine with the car standing still, I'm still betting that it's the heat shield.
If that shield can be moved at all, it is detached and will rattle.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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