As in this image,
I want to fill a box with some tools. I applied rigid body (active) to the tools and box (passive). All objects are made in real-world scale. The object's shape is changed to MESH type. I decreased the margin to 5 mm and ran the simulation. And the result is:
Tools go away from the box. If you want to look at the settings I applied to the simulation, the Blender file is here: