It's more or less honor system, but there is some element of personal accountability too. If you buy a coral or anemone that's super fancy and supposedly has some lineage, make sure it LOOKS indistinguishable from the real deal.
If you have seen csb anemones in person, they look so vivid, even compared to "nice" RBTAs. If somehow you get scammed into buying an incredibly vivid anemone that isn't actually descended from the one you are interested in, I would argue that it doesn't matter at all, since you got an incredibly vivid anemone.