$500.00 is not a bad price, but still high enough not to throw the money away on a incorrectly numbered Legacy engine.
Yes, they are not perfect scale, but I value all my Flyonel Legacy engines as if they were brass. They are darned neat, and I mourn the loss of the USRA 2-8-2 and 4-6-2 dies. They could have gotten a lot of mileage from them. As they could on a Legacy USRA 0-8-0. (Hint, hint) Legacy first, please, cheapen it for the trainset crowd later.
Maybe I'll hold out for a subsequent run of C&Os with a hopefully correct number.
I think it matters to a lot more than 0.1% of us.