I picked up the box pictured below at the recent ECRA meeting. The top is labeled 38 S&W, and the front 9mm Parabellum. The top of the box is about twice the size of a normal 9mm P box, and the heigth is about 1.75 times the heigth of a 9mmP box. The only thing in the box was a square block of wood, apparently to give it weight.
Turns out this was a prop from a French movie. Clearly they did not demand a high degree of accuracy with regard to ammunition. I wonder what the gun was???