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...weird that someone would do that.
Believe it or not, there are roll hunters out there that deliberately scratch the coins on the ends of their re-rolled coins that they return to the bank, as a marker to tell themselves and other roll hunters "this roll's been gone through". Of course, once the roll is busted open and the coin re-enters circulation, the markings lose their meaning, and it simply becomes a "damaged coin".
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