About this detail of the Tiger
For each MG in a Tiger, and I believe other Panzers, two boxes of accessories were provided.
This box contained tools specific to the MG. This is its original paint and decal, which reads "MG Werkzeug". Notice in the opened box that you can see two bolt heads. The bolts secured this box to the tank.
These are the dimensions of the MG toolbox.
The second box was larger and it contained a folding bipod, a butt and other parts that would turn a tank-mounted MG into an ordinary infantry MG. (If the crew had to quit the tank in haste, without time to install these parts, they could take the MP40 stored in the tank).
In the Tiger 1, the small toolbox was not kept in the turret, but in the rear right-hand corner of the fighting compartment. This Tiger in an American museum has been repainted and the box is missing, but we can see its fixing holes. The toolbox is on the lower side of an ammunition bin.
By the time of the "Late" Tigers the box was a little higher, halfway up the bin. I don't know when or why it was moved.
The larger box was stored in a metal frame with a belt. This example is in the Bovington Museum Tiger, with its original paint. The frame is attached to metal strips by four screws.
In late 1943, probably October or November, the Tiger's turret storage was simplified, with most items being taken off the walls. The large MG accessories box was moved to the turret floor. Its storage frame was now fixed to the floor, as this photo shows, under the main gun. It apparently remained there for the second half of Tiger production.
Befehlstigers had no turret MG and therefore didn't need these two boxes. I don't know if the later Befehlstigers had the frame on their turret floor, but the earlier ones didn't have a frame on their turret wall; radio equipment was fixed there instead.
When eighteen Befehlstigers were converted back to normal Tigers in November 1943, the frame for the large accessories box was added to their turret wall, farther back than usual, only centimeters from the side hatch. The small toolbox was added to the hull corner, but it was put high up, close to the roof, because the feed to the Sternantenne occupied the lower corner.
The hull MG had its own set of accessory boxes. Its toolbox was fixed to the roof support behind the radio operator, as indicated here.
In Befehlstigers its position was slightly different because this panel was crowded with radio equipment.