I found one in my car, as I told you. I'd picked one up on pistol bay #1.Here is some more crazy stuff I was asking you about this the other day.
https://www.range365.com/end-brass-cartridge-cases/
The case is supposed to be nickel plated, the base aluminum. The one I picked up was severely corroded at the base (aluminum oxide) so of no use at all. They are garbage in my opinion. I read an article about them when they first came out with the idea, regular dies will "stretch" the gap there at the base join. Bad juju for a case that headspaces on the mouth.