polystyrene

i've had to replace the window regulator and noticed that when the window dropped inside the door it landed on / hit a large square piece of black polystyrene. during the impact hit has split it and deformed it a little and more it from its original location. i thought i'd moved it back to...

I've recently bought an Altea XL for the missus and have noticed that there is a polystyrene cutout beneath a flap in the boot mat (right at the very backof the car in the centre). It appears to be shaped to accomodate something specific but mine is empty. All I can think of is maybe a fire...