Agree. There are strict regulations regarding explosives storage, including fireworks. I worked at a shop that sold fireworks during the festive season. We had our own in-store bunker, where the fireworks were kept overnight. And when the fireworks were on display, each batch of each type was in its own metal box (actually a carpenters toolbox - we had about a hundred of them).
During the five or so days that we sold the fireworks, police were in twice a day to check compliance with regulations. Mostly not selling to minors, but the rest too.