[methdmx]

So I heard a rattling in my driver's door when I closed it the other day. I took the panel off and found these 4 parts/pieces. I looked all over the door to see if I could figure out where they came from but I didn't see anything, at least on the outer metal anyway. Does anyone know where these belong and do I need them? I just don't want anything falling off or breaking.
Sorry for the crappy quality pics, my camera sucks.

This looks like a cap or plug of some kind...




This looks like a screw in an anchor but the screw was cut/broken...





The is a black plastic piece definitely broken off of somewhere...




This is a normal flat head screw with a metal washer...