I love this, there is no way that someone is punching out 3" metal discs for sale, they are a byproduct of another process.
Selling them like this is a stroke of brilliance. And Les, well done for spotting them.
As kids, my brother worked for a sign making company, one of the holes they punched into thin plate steel was star shaped, this was the time of the Bruce Lee/Kung Foo films, all I'll say is they made great Shirikins!