Well it seems like they are pins that have been put through a hole to hold the inside chassis (metal) to the outside chassis, i guess thats the word, the black part, and melted on the other side of the hole so the pins cant fall out.
Sorry for the run-on.
Chumly sorta of described this in his mod when he took the inside out to paint it orange.
Josh, the reason I want to take it out is so I can paint it, also really good idea with the front grill, but if you are gonna do it put them on the inside and try to make the flush with the front.
Im gonna try and look around some more with the case and see if I can figure out some better descriptions.