Thanks for the clarification. I checked PTTravel and found no bucket with the ZE designation. All of the other buckets are 9. Interestingly, I learned from CO that there IS ZE inventory, however, I was ticketed on a stepchild airline (guess which one) so I was not ticketed in that category (but sold a B fare) and only the other airline can change it (they wouldn't). So that is another mystery solved, though not satisfactorily for me!

Anyway, I think it would still be helpful to explain to other elite but relative unsophisticates what you should do if you end up purchasing a B fare, either in the "Greatest Mysteries" section or on the CO website. Better not to have to wait in the EUA queue until others leave you groveling!