Can't address your rattle, but that thing that looks like part of the stereo is most likely the inflatable restraint passenger presence module. In other words, it is the module that receives information from the Gel Sensor in the seat to determine if there is a person present, or if a person is present, is of sufficient weight to activate the passenger side air bag.
So, I would say not to mess with this module for safety reasons.
My question on the rattle is, "does it go away when someone is sitting in the seat?"
My suggestion is to let the dealer fix it.
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Black Sheep Hummer Squadron
(ME TOO)
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