This reminds me of the zinc jar lids I found with the broken glass seals still inside. I found them in an old roadbed next to a modern road. With all the beer cans and bottles from current and past generations I wondered if maybe, just maybe, these could have been tossed out the window of a moonshine runners car. They were not really close to each other and there were no jars to be found, they were also about 6inches deep. I may just be trying to imagine a more romantic past for them, they could just as easily fallen out of a wagon or something when the old road was in use. I'll never know, but it is fun to speculate! I'll post a pic sometime.