It's a little mind-bending. What does "legit" even mean? The exact same genetic makeup as a particular plant? Descendants of a particular plant or plants? Seeds that you buy from the person or company who made the original cross, or an authorized reseller? There's no legal protection for cannabis genetics. Sellers can call a pack of seeds anything. It's the wild west, and most retail seed buyers 1) don't know how seeds work, and 2) have never had the "real" version of the thing they think they're buying. Which is not to say that white label or knockoff seeds won't grow well or make good flower. But if I'm spending four or five months growing out seeds, I'm buying from the people who made the crosses.