Unfortunately there are no het Piebald markers on any Ball Python, normal or morph. Any "markers" you may have seen are a result of the extreme variability of normal Ball Python patterns and can be present on both animals that have the gene and those that do not.
There is no way of telling if a Ball Python truly has a recessive gene until you spend years feeding them, breed them and see the offspring.
This is why it is very important to trust the breeder when buying any BP that is supposedly contains a ressive gene.
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