S550: First Thing Fixed
That's the fancy metal handle that lifts the floor of the trunk to reveal... just more storage space (since there is no spare tire in this car). On the right, you can see a piece has broken off, which means that the fancy metal handle just pulls right out of the plastic housing, doing nothing to lift the floor of the trunk.
I found this broken bit when I picked up the car. I asked my selling dealer (Mercedes Benz of El Dorado Hills) if they could comp me the replacement part. They declined. So I bought the part myself ($63), loosened the two screws holding the bracket in place, and it's fixed!