Tesla Motors Club

I found a object I can't identify wedged behind the passenger seat of my Roadster. It seems to be a couple of plastic boards covered with felt, and one has an elastic band around it. The two were originally joined in a T-shape by a couple of tabs, now broken:



Here's roughly how they look when put together:



My intuition is that this might have been something that belonged in the trunk, but I really don't know. Can anybody identify it?