One of the difficulties with getting a grasp on the scope of this problem is that it does not become apparent until the animal is larger. An honest mistake, if the animal changed hands when it was smaller, it was likely sexed one way or the other then. As it matures, the new owner might assume as a means of explanation that they got a mis-sexed animal to explain its physical shape. They might also think they got impure bloodlines to explain lackluster color. And they might assume that they aren't doing something right, or that the animal has some misunderstood sex drive, to explain why it doesn't show any initiative to breed, or accept advances from persistent others.
As many breeders ship out 90% or more of their animals before large enough to even begin to think its a she-male, cause the bills have to be paid, we are not in a position to get a grasp of the frequency of this problem. My belief is that most of these animals are sold as females initially. It does become apparent sooner if one has the siblings still to compare it to as it matures, as the differences are more readily seen by comparison. Otherwise, many hobbyist/buyers will find themselves stuck in the above confusion if their little girl turns into a mix. Regarding its actual sexual organs, I do not know what is or is not there. It could also vary from one she-male to another, and I do not know that it would meet most definitions of being a true "hermaphrodite", although I have used the term before. We have also used the slang "she-beast". My current estimate is that it is easily less than 2% of all animals, and possibly less than 1%. I think I first suspected such in 2001 with some imports, and by 2003 had seen enough random CBB instances to know it was a valid phenomenon in panthers.