I'm not that knowledgeable about collection value - never bought any trains for anything other than running them and having fun, but with a limited amount of these cars being produced as "mistakes", is it possible these could be a rare item in the distant future and therefore valuable?
Not to sound like a naysayer, but, mistakes must be very rare to make collectability. Also, low number in quantity. I think there were enough produced that the market would not appreciate in value. I know there are people out there with upside down lettering etc. and they don't seem to hold the value in high esteem. I'm glad they are going to make them right. As far as collectability, we will see, especially if they don't want the wrong shells returned. Then the auction sites will tell.