Full cases are labeled with a marker if the box markings don't show when on the shelf. I use .50 caliber ammo cans in a steel office cabinet, the separate boxes are stored in them, and they are labeled in marker so I don't need to open the cans to see what's what. The marking cleans off with a bit of alcohol, so I can swap cans if I need to, and don't need a label maker, also, the lettering is the right size to read quickly, a little label doesn't work for me anymore. The locker is great for ammo, there's about 4 full cases in there, some 8mm spam cans, and maybe 20 of the .50 caliber cans, so for $75 at an office surplus store, lots of good storage and lockable doors. The bottom shelf is about 2 inches above the floor, so a little water won't hurt, and it's unobstrusive out in the shop, out of sight, out of mind.