Back in the day virtually everyone disconnected their speedometers to extende the 5-50 warranty.

Cars with original mileage showing are very, very rare and how do you prove it without a ton of receipts over the years showing the mileage progression. I know with our car the speedometer cable gear box that mounts into the transmission seized up several times and went quite a while before being repaired. I was beyond warranty so it didn't matter any way. I just drove by the tach. It looked to me this year that big scoops, stripes, and pro touring were what sold best. COPO cars are too much the plain Jane sleeper for this crowd.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now.