Guarding guns

This is an interesting photo:

I was struck by the effort that someone has gone to keep all these weapons in neat rows and columns, rather than throw them into a compact pile. I may be missing something, but the only reason for it that comes to mind is the need to guard against black market trading. With everything in a neat row, it's harder for the guards or anyone else to snatch a few weapons without it being noticeable. A practical example of how our perception works: no one would notice a hundred rifles missing from a big messy pile, but if you mess up a nice row & column pattern, the gap would be too obvious to overlook.