I noticed during highway driving that my passenger side corner of the hood was shaking during high speeds. I checked the hood latch and it was on. In investigating this I noticed that on the passenger side there are 2 openings. One of the openings has what appears to be a black garbage bag and it feels like there is soft foam inside. I checked the driver's side and it doesn't exist. I refrained from removing it as it stuffed in there so I wasn't sure if it was some sort of a.) insulation, b.) sound deadening, c.) both. And how come its not there on the driver's side?