I have quite a few, but lived most of my life next to a large army base. Many for a quarter at a yard sale.

I have my Dad's, most go back to WW2. When I sold the 160 acres and bought 80 I moved lots of barn items in my 24' flatbed trailer. I notied the other day I had set one GI can out next to a cone seeder. I didn't hold much hope for the contents. It was one of Dad's painted red. WW2 era. I opened it and found some small stuff 24 V gauges and Military parts I took off of my old M-38 Willys Jeep. Dry and nice inside after 18 months out in the weather. Try that with your tupperware as it gets hammered by UV rays or stepped on by cattle.

I have one 50 cal full of knives, others have ambo in them. Yep ambo in case some one is searching for the right spelling.