Haven’t the faintest idea. I was reading down your thread and had never heard of purchasing cans for prepping like that so looked it up and, as there wasn’t a link, posted what I found.
My prepping is done thru Amazon. I set aside part of my fireplace room for maybe 30 cloth shopping bags organized with staples that could provide vitamins and protein in an emergency and use them as a super pantry. Wouldn’t help long term, but would take care of shorter outages. Just have to make sure they get rotated thru regular usage.
I know a lot of churches do canning for shipment of food overseas so I assumed it was something along those lines.