I spoke to a gentleman a few weeks ago who asked whether a Weber wagon box would normally be found on a McCormick-Deering running gear. It's a great question and one that cuts to the heart of how things were done back in the day. Oftentimes today, collectors look for the perfect original vehicle... One with strong paint and logos, no unsoundness in the wood and a world of accessories that somehow managed to stay with the wagon over the last century. Truth is, there is almost always a compromise to those wishes.
...
2025 UPDATE... As indicated by the above story, wagon boxes and gears were often 'married' by the end user. As a collector of some of the rarest survivors, this practice is not one that concerns me. In fact, some 'married' pieces can have a richer history and personal intrigue than those vehicles with the same brand gear and box. I have a barn find wagon that has a Fish Bros. gear and Winona brand box that I'm as proud of as any other.