They were in my father-in-laws basement. I cleaned them up and zip tied them to the posts around them. They are perfect for it lol. Fresh cultures are lower and the one I am currently feeding out of is on the top of the stack

I will ask him where they come form. They are old. I don't even know what they would have been used for previously. They were in the trash pile after his basement flooded so I rescued and repurposed them.

here is a better angle of them. This is an older picture, but shows it better. There are 2 of them butted up to each other in the corner.