The odd box shown in the stowage diagram is shown in this photo.


This Czech Firefly has a more typical stowage box.  Most don't even have this nice a box, having one or two ammunition cans in stead.  The
travel lock shown in the official stowage sketch is'nt typical either.  Most have the same lock as the Vc in the same location relative to the
turret.  It is barely visible on the Czech Firefly above.
 

Ordnance Stowage sketches for the Ic