To save a few dollars I am now making my own dummy battery boxes.
Why two battery boxes...???
There is no room to mount the 3 x AA battery box in the centre of the back and...have it recessed to reduce the depth because there is LED strip in there to illuminate the name letters. The only spot is on one of the wings which would unbalance the light so I have opted for a 2nd (dummy) battery box that holds three spare batteries - on the other wing.