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Honestly, I think you're overthinking this. An 18k-mile 2002 Z06 in good condition is a home run. The car's history, rarity, and condition make it a no-brainer for a collector. Just make sure the service records are complete.

Have you verified the VIN against the production records? Chevrolet keeps detailed records of Z06 production numbers. A confirmed original 2002 Z06 is worth more than a Z06 with a questionable history.