The paperwork is only as good as the person who provides it. I would ONLY buy hets from a reputable breeder. Basically, someone with a good reputation and a functioning presence in the reptile community.
But yes, it is possible for two 100% hets to never throw a visual morph. The chances are that it will happen eventually, but I have seen breeders work with a het pair for 5 years before finally producing the homozygous form.
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