It's going to be hard to determine good eggs from bad eggs your first time out, especially with Leopard eggs.
Also why I was asking if they were S.p.pardalis is that their eggs needs to be cooled to break a natural diapause in the subspecies egg's. They would need to be cooled to 60F for 2 or 3 months to break the diapause.
S.p.babcocki eggs don't need a cool down period to develop.