As Fintro11 stated, there is a plug for the wiring on the passenger side along side of the rollbar. You have to pinch the sides to release it, and on mine I typically find this the hardest part of getting into the engine bay.
Once the wiring is disconnected, there are two "thumb screws" on top of the bose speaker. Turn those to loosen the shelf. Then you can just lift it out.
However, note that to get to the drive belt you will have to access the front (not the top) of the engine bay. you access that from the firewall behind the seats. Open the top first, then you can remove the carpet on the fire wall behind the seats. Once the carpet is removed, you can see the access panel on the firewall behind the seats.
When I first bought my boxster 5 years ago, I found a small pile of items (paper, straw, cigarette butt) in my engine compartment, similar to yours. I figured one of the previous owners had stored it for awhile and a mouse started making a house up in there. I don't really know, but I keep the engine bay a lot cleaner now than when I first bought it.
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