Look for radioisotopes from the war of 2031.

Let's say there was a Corvette made in 1967. Let's say that in the 2030's, John Titor brought it back to the past. Let's say we found this car because it had a duplicate VIN number.

Then if we put the 2 cars side-by-side, we should be able to tell if one is a re-VINed stolen car, or if they are both the same car.

I suggested we look at welds that were done by hand in 1967 to determine if the 2 cars were the same car.

Does that make sense?

In this scenario, both cars would be made in 1967.

One of the cars would be a few years old.

The other car would be about 70 years old.

Yeah?

> One of the cars would be a few years old.

Let's recheck your math. A 1967 Corvette would me more than a few years old in 2023.

We’re talking 1969 when the time travel scenario occurs.