I've had the rear deck rattle for many months, and have tried various methods (as recommended on this forum) to get rid of it without success. It was driving me nuts!
Then one day I tried stuffing some car wash foam thingy and started stuffing it between the back seat and the rear deck.....and immediately the rattle was gone. I also popped open the rivet clips you see next to the longer sponge, and stuffed a few more similar sized foam behind/under the rear deck cover.
This was a couple of months ago and the sound has never returned since! Was amazed how a simple fix did the trick! Hope this works for you as well....
