Why do you need to know where they're going? How would that change anything even if you did get them back? Seems incredibly selfish to me. You know kids collect these coins right?
It also gives a bad name to CRHers and collectors too. Might want to rethink your actions.
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Sorry but you're wrong. It is absolutely necessary to mark them so I know where they're going and when I get them back. It helps me track them. I date them so it's not an issue. I don't mark every coin. I only mark beat up ones that PCGS would never touch and have no numismatic value. The markings can always be cleaned off so who cares. It doesn't effect their ability to be used. They are not U.S. currency, they are U.S. coins. U.S. currency is paper money.
If you talk about the deface coins issue, then why is it legal to melt silver U.S. quarters, dimes, halves, & dollars?