With a container on it, I doubt that most people will bother to read the chassis reporting marks, if they can get close enough to read them at all.
In my case, I'll reletter several of them for my narrow gauge, which is working to replace as many box/reefers as possible with containers. Most of the lines general freight is deliveries to backwoods stations and settlements, and arrive by truck anyway. With containers, they can be loaded in Helena or Missoula, then put on flatcars.
The rest will likely stay as-is, and be used for TOFC service.