And specifically for VINs... a few months back, there was a used Model S listed for sale down in South Carolina, not too far from where my parents live. It was much less expensive than it should have been so my BS detector went off. I asked him to send me the VIN, which he did. It was a legit VIN... of an entirely different Model S (different color) that was already for sale in California. Fortunately the guy was too stupid or too unsophisticated to send a valid VIN sequence that was *not* already listed for sale somewhere else with a different configuration. That and the
Google Maps photo of his "used car dealership" (is that sign made of cardboard?) were enough to convince me to move along...