Possibly from change (obtained back in those years) stored in a jar in someone's house, that was hand rolled, taken to a bank, and made it's way to you. It's also possible that some bank somewhere (or some person for that matter) had rolls sitting in their vault (home, in the case of people) for a decade or so, and they've finally gotten around to getting rid of them.
I've a jar of cents from the 80's, just about all the 70's in the jar are in red-brown, and almost all the 80's look pretty mint; no way to know what they looked like when they entered the jar (as I was gifted the jar and thus have no clue). And I've had some manilla envelopes of cents from the 80's (they're no longer stored in them), after 30 years the cents touching the envelope were toned, but those that didn't were as shiny as the day they were put in there.
I've a jar of cents from the 80's, just about all the 70's in the jar are in red-brown, and almost all the 80's look pretty mint; no way to know what they looked like when they entered the jar (as I was gifted the jar and thus have no clue). And I've had some manilla envelopes of cents from the 80's (they're no longer stored in them), after 30 years the cents touching the envelope were toned, but those that didn't were as shiny as the day they were put in there.



















