The file 'Stackable 5.56/.223 Ammo Box 50ct Fused With Lid. 3D Printer Model' is (stl) file type, size is 25.6KB.
I just wanted to stack them more solidly so I fused the lid to the bottom of the box. So, the lid of your bottom box(s) will be a whole new case of 50.
Let me know if it needs improvements.