trunk rattle

My whole purpose here is to decrease trunk rattle, and maybe make hair tricks possible. I have a 2003 Pontiac Grand Am. It's the dead base model, so it doesn't have folding rear seats. What if I were to make a sub box, and have an external port (or half external, half internal) going into the...

My trunk is done up with dynamat but it still rattles reallllly bad. Does anyone have any tips or tricks for me?