Yeah Aubrey I get very frustrated at not knowing why something is being pulled/deleted or why they do not email the posters as to why or possibly delete specific posts instead of just whole threads.
I do not know for certain about the piebald gene in black rats but I suspect it is a proven but rare morph at the moment sort of like the piebald bloodred gene is(I believe).
I would suggest emailing Don Soderberg at south mountain reptiles (listed here or sponsor here on KS) as he works with black rat's, leucy black rats, and may be working with the piedbald black rats without listing them. I know he similarly works with pied side bloodred corns but doesn't list them.
Also even if he doesn't work with them himself he has always been willing to answer questions with me even when they did not relate directly to his own animals.
Sean.