My belly pan is the proud owner of two of these that I know of, and probably the other one that was missing when I got the car
. I'm convinced there is a little trap machine that collects them down there with little microrobot ants that pick them up and place them into a digester because even when I dropped one and I was pretty sure I saw where it went, no mirror and flashlight could find it.
I now know that when I remove the tub that no matter how hard it is to remove the clip, pull it out since when you pull the tub it will go SPOING into the bottom and not stay in the tub.