Not sure if it's die deterioration ,or a plating issue , or a combination of both. I have many of them far worse than these , also 2010 with the same issue
The third one wasn't "found" all three were together when minted. There are plenty of attempted fakes out there . You have a better chance of finding a chicken with teeth , than a genuine 36 dot. In the wild
Smallcentguy , the coins end up in bins of thousands before they're sent out to be rolled ,so one would expect coins from different dies to be mixed.These came from Canadian Bank of Commerce rolls . I'm no expert for sure , but I don't think the mint keeps coins from each die separate
yes I understand the perils of roll hunting but as I said the 1967 roll was very good as I posted in the error section so I know it had never been serched