Dynamat.....lots of it.........i also shoved a little piece of a dowl rod up next to the license plate light bulb housing...it put outward pressure on that piece so it didnt rattle...it worked great and only took like 5 mins to do
dude I drilled hole into the back of my trunk. put carriage bolts through your top license plate holes in the back of your trunk lid and tighten with wing nuts...