I followed thru with a similar scam. They offered me money to put an ad sign on my car. When they sent me the check, I called the company name on the check. They said the checks were stolen from them and the FBI was investigating. When the guy called me back with instructions to mail him back some on the money. I told him no. He threatened to call the cops on me. I told him that was OK because I had notified the FBI. Never heard from him again.