I get the picture, but I’ve had calipers that lasted over 20 years, never had one go bad in just 6 years.
It is unusual for a 2016 Camry to need new rear calipers. (I expressed my skepticism earlier, above, in this discussion.) Was this car driven a long ways with the parking brake on? Rear brakes ever immersed in water? Unusual but not impossible, I suppose. Physical damage due to a major wreck also possible, but even more unusual than some other scenarios.