I just reassembled my backseat after leaving it out for a few weeks. Rather than dynamat the rear shelf, I think the best place to put the dynamat is actually on the metal in the trunk near the sub. My biggest rattle turned out to be a loose section of my box, but the rear deck has its own issues. When I took mine out, I found two strips of something that was probably sound deadening gunk that came loose and was rattling against the board. Looked factory, so you probably have them too. good luck.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>
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