That’s all true, but I also know that many people feel more comfortable if the buyer has a CCW, meaning they have a clean record, or at the very least show an ID like a drivers license. People up to no good tend to act squirrly and if you don’t feel good about that, then you walk. Not fool proof, but again, most people looking to buy used guns aren’t criminals.
Of course just like selling a phone or golf clubs on craigslist, you need to exercise caution, and criminals will target you for theft.