This actually reminds me of some ammunition that I found a couple years ago in an old storage building on my parents' property. It was Remington 45 ACP in a box old enough that I didn't recognize the design, so I'm guessing at least 90's if not older. The shells themselves were full of crusty green tarnish of some sort. I guess its understandable since they were sitting in a non-insulated wooden building about 5 feet from a window that had been busted out at least 10 years earlier. A friend of mine recommended that we see if they still functioned and I figured what the hell. We might as well. It was around two-thirds of a box and every one of them fired on the first try through a Rock Island 1911. They pretty much would not cycle on their own at all, but they still fired once they were in the chamber.