This is one of my latest cars I recieved from in the mail from e-bay. When I got it and took it out of the packaging, I noticed that the car was heavyer that a normal car with weights. I opened it up and found this stuff in the pictures below. Anyone have any ideas or clues on what this thing is?? There is a hole cut out in the bottom of the car floor with a switch to turn something on or off but it dosn't work.