Folks "wish" for factory errors, but they are really not a reasonable possibility.
The parts were numbered for a reason, i.e. so they would fit.
They would never pass final factory inspection with mismatched numbers.
I see only two opinions, one vastly out-numbered by the weight of evidence against "factory errors" that result in mis-matched numbers.
Strike out/strike over corrections of numbering do exist, which further supports the "no factory numbering error left the factory without correction" camp. JMHO.
As to a sellers opinion is just that, and worth no more than yours.
I always believed that : a mismatch is a "factory error" if selling; it is a simple but costly mismatch if one is buying.
