my rattling sources in my car include:::
1) rear brake light assembly
2) license plate
3) loose toys in the back (golf clubs, fire extinguisher, dead body... )
THE SOLUTIONS...
1) pull off brake light assembly- wrap electrical tape around the metal bracket that holds it there so it will stay on there tight.
2) put some self adhesive foam on the back of the plate.
2) take out the toys... and make sure that dead body is dead and not pounding on the trunk to get out.
good luck with your endeavors
:smoker: