Check your balls
Nah usually mate if there is a noise coming from your boot its the strings for the parcel shelf
Hahaha
I read that first line and thought... EH?
Just finished messing around with the car,
Took the plastic cover off the inside of the boot lid and i was confused at first, i couldn't see anything that would cause it.
So i stripped the back lights out and found that the left light had a rattle. The red reflector inside was rattling around, looks like they are a sealed unit and i couln't ge inside of the bloody thing. But i managed to sort it out by pushing it back into position and dropping a bit of super glue on the little tabs that hold it.
YAY fixed.