Dutch army, Johan Herman Fuhler, somewhere between 1945 and 1950
Yes, the tool box has the key lock on it. I'll take some photos tomorrow. Can I put photos on here ?
You can post photos but it requires an external hosting service. I use imgbb. It's free and straightforward..choose the HTML full linked option.
The locking toolbox was used 1936 - 1940, but earlier versions were narrow, as per civilian. The wide WD type holds quite a bit more - Not that you'll need tools all that often on a WD16H :-)