Warning to everyone:
The scammers are getting incredibly sophisticated. They have had some success in the pinball hobby (several people have lost money to scammers) so they are all over it with learning our lingo and everything else. They are almost assuredly reading this thread and every “tell” you guys mention here they will address and fix. Discussing them makes them even better.
As ForceFlow says, a personal inspection and cash on the glass is the only way to trusty be safe. Doing business on the internet with faceless people is dangerous. Scammers know how to work the system to get verified, never depend on a verified account. Be careful on the internet and if a deal sounds to good to be true it probably is. Everyone deals with people at their own risk, be a sophisticated buyer and never send money friends and family to anyone who isn’t actually your friend or family member.