I get those scamers for every classified ad I list. All of them want to send you a check. It is a scam! He will not go to the authorities because what he is doing is illegal. Tell him that you found out that the check is fake and you have submitted it to the FBI as evidence. I promise he will never contact you again. I see he has a Yahoo email account. You can report his email account to Yahoo and they will investigate it also. I've never had one yet that emailed me from anything other than a free email account. What ever you do DO NOT SEND HIM ANY MONEY!!!!