Just one could be dismissed as random damage. Having a dozen or so of each denomination, and with each denomination treated very specifically the same way, implies some rclear deliberate intent - the coins had to be notched at those specific points, and notching at some other point just wouldn't do.
I can't fathom why those notches in those specific locations are important. Just because there was deliberate intent, does not necessarily mean that intent is going to be rational, or decipherable. MY best guess is the notches might be for assembling the coins into some form of trenchart-style pieces of art - but this does not explain why they are all scored with a III in exactly the same places.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis