So, I'm back with an update. It may not be what was in the earlier picture, but that mystery hole perfectly fits the BMW combination screwdriver (part # 71111179629) as suggested by vreihen. I had one already and now it lives in that spot. Also, in the course of searching pictures of the frunk...
I am trying to solve a mystery. The mobility tray obviously holds the mobility kit (air compressor and tank) and in my car, there is a tow hook, and a spot for the locking lugnut key. But there is one more hole that I can't figure out. Does anyone know what goes in the smaller round hole?
Here...