In my LT model there's a panel on the right side of the rear hatch area that looks like it might be where a subwoofer or something goes on the Premier model. It's opposite the cubby for storing the EVSE. Anybody know if this is just a blank cover over a hollow space? It would be nice to somehow convert it to another storage cubby for the cars that don't use it for a subwoofer (if that's what it really is for...).