The plastic tamper that came with my machine was actually molded onto the end of the plastic coffee
scoop that came with my machine.

I cut it off (& threw it away) so that I could use the scoop easier.
That means my first "real" tamper was actually a Rancilio plastic tamper that my friend was throwing away. It worked so well that I still have it, even though I don't use it any more.
My second tamper is one I designed myself out of stainless & aluminum. It has an ergonomic handle that I designed to a tooling production line project at work, & a machine-specific face that matches the dispersion screen profile.
My third (& last!) tamper is a Reg Barber short convex tamper.
He's dead, Jim... You grab his tricorder, I'll get his wallet.