Only ever seen one and that one only had two small blotches so barley a piebald at that. Do know a guy who shot a 150 "piebald" in IL. The reason for the air quotes is the deer by most all our definition would be called an albino but those are illegal to kill there but it only has to have a tiny patch of brown to be legal. The deer had a spot of brown about the size of a dime just in front of the eye. To me it looked likely that the fur was brown due to the sent gland there. The deer had pink eyes and was almost completely blind. Hell he got it by walking up to it in an open field since the deer couldn't see him. Did make for a cool full-bodied mount.
How much white was on the one you saw?