Your powder storage box does bring back memories. If only I was a bit closer. About exactly what I remember in the gun shop around the corner from the house where I grew up in the mid 1970s. Place sold powder from bulk containers, with the customer bringing in old metal powder cans with the paper label pealed off, that were filled and identified with a ‘magic marker’ label written on the can. Still have a few of the old cans, as they don’t go bad. If old powder cans weren’t available, empty metal coffee cans with plastic lids were used. Maxwell House Coffee comes to mind. Likely frowned upon today.April of 1980 I opened a very small gunsmith/gunshop. I carried black powder back then and I had to keep it in this very container.
Don't remember if the locals checked it and I never ever saw anyone from the ATF.
Wonder where @Old Hawkeye is with his code links showing this type of powder storage is a ‘pipe bomb’? Things have change over the years and he might be correct, but I would sure like to see some actual links.