Sort:  

My father used that to store coins lol

But I don't know if that's what it was designed for

Is it a rest for (extra) small animals? 😅

It's a blank, some optional packages of the car likely had another switch or button in that slot, like heated seats. They use that piece so they only have to stock one kind of the plastic frame around it to make things cheaper.

Honestly I do not know what it is for