FWIW, it’s tougher to lay your hands on ammo cans. They are now considered traceable items and not freely procured anymore. Additionally, I saw somewhere, ..I believe some homeland security regs label ammo cans as being associated with items of interest for ‘terrorists’. Some perceive them as providing justification for arrest or at least a ticket and confiscation if observed during a traffic stop. Just be sure to relabel/repaint yours so it isn’t as quickly so identified by the illiterate legalist.
The Army Surplus store I brought mine from hard dozens in stock.