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Just look inside the trunk. Tap the deck from the bottom with your hand. Note how it doesn't thud, it rings sort of like the surface of a drum.
You want to dampen that. The options are to do it up inside the trunk (where you can see it) or remove the shelf inside the car (behind the rear seat) and do it that way (in which case it's invisible.) Note that if you want mount speakers on that shelf you need to remove that rear shelf cover anyway, so that's the time to it -- getting that shelf cover off is somewhat of a pain in the neck in order to get access to its fasteners.
In addition remove the inside card from the trunk lid; the lid resonates VERY BADLY. Same deal here -- tap with your fingers and apply dynamat to the INSIDE surface of the metal of the lid until it doesn't resonate. CAREFUL WITH THE LID; if you use too much it won't stay open as the lifting torsion springs aren't very strong!
I found the original behavior of the lid HIGHLY annoying in that it would "spring" open when unlatched. What I have now it unlatches but doesn't spring open, but when lifted by hand (easily done with a pinky finger) it stays open. If you use too much dynamat you'll put enough mass on the lid that the torsion spring mechanism can't keep it open, so be SPARING and use only enough to dampen the resonances there.
I'd have to rip the car apart again (especially the shelf, which is a PITA to get out) to show you with a picture... sorry.