Thank you for clearing that up! I looked over a couple of them this afternoon and it seems several DO have a "white" toenail, and the ones that do, it's always on their middle toe, and a couple of them also have discolored (peach-ish) skin on the underside of their toe near the nail.
Yep, the middle toenail is mostly where that defect shows up. Orange toes are another defect, and that can affect all the toes but again on the middle toe it seems to be the most common. Those I also consider culls and don't breed.