I’ve bought a couple of things off Craigslist. One was a vintage WWII M-3 1911 holster and a Virginian Dragoon (357 magnum SA revolver) made in the 1970s by Interarms.
Sales were in the parking lot in front of a busy store on a Saturday morning.
Did you hear about the child that was kidnapped right out of a shopping basket in a busy Walmart store, in the middle of the day, while the mother was less than two feet away?
That kind of stuff doesn’t always work ... :-) ...