Lets say someone gives you an animal, and its a Heterozygous animal.
This is a gift.
No recompensation required.
Would you expect/demand paperwork???
No I wouldn't. I wouldn't expect the giver to stand behind a freebie by guaranteeing it. The perceived credibility of the giver is up to the receiver of the gift. A het will eventually prove itself. Beggars can't be choosers.