Tell you the truth the Het guarantee is basically the breeders word. If your a reputable breeder your word is on the line so it is a pretty good chance that they are giving you what they say. The only way to be 100% sure would be to breed the het with a visual animal ie 100%het pied X pied this would get you (theoretically) 50% hets and 50% visuals. Of course you can have really bad luck and get no visuals so i would think to breed it a few more years to prove out. I would guess after 3 breedings (I guess that would depend on egg count also) with a visual and no results then it can be disproved. if it is a grown animal this is 3 years if it is a hatchling 5+. After all that time you would then have to prove to the breeder that it is actually the animal they sold you (long shot) and then have to somehow convince then to reimburse you. this is a lot of headache and you most likely wont get anything out of it. I would just go through a reputable breeder and be done with it.
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