I think you mixed up Eyetech with Genesi, it's the Pegasos board that needed to be exchanged some times (and still does for G4).
Normally, the chips should be checked for faults
before being built into a board. Presumably the extra 16 are Motorola's way of avoiding niggling warranty exchanges. However that does suggest a chip failure rate of 8% on leaving the factory. Eurgh.
