Probably has a tidy façade, with a jumble full of gaps in the middle. Edit: Actually I reckon they deliberately oversized the container a bit so it's easier to

Probably has a tidy façade, with a jumble full of gaps in the middle. Edit: Actually I reckon they deliberately oversized the container a bit so it's easier to pack the cash in. You don't want to build it too small! (Relative budget notwithstanding). Another design constraint it has to be a cube, and has to fit nicely to the dimensions of the banknotes on the front face (aspect ratio and size) without having a big gap on one side.