A new scam?

Anyone know anything about this scam?

My husband received a $2400 check (the bank was US bank) in a priority mail envelope. Nothing was in the envelope except the check. The check was made out to him and the name of the account on the check was a man in Georgia & had a phone number on it. This check was sent to my husband at work-which is the police department. Anyway he took the check to the bank and they confirmed it was fake. He called the phone number on the check and spoke to the man who knows nothing about it! Whatever this scam is....they haven’t run across it at my husbands department. My husband hasn’t been contacted by anyone telling him to cash the check and then do something specific with the money—like the secret shoppers scam when the victim cashes the check and is then instructed to test the western union feature at wal-mart by sending money to the scammer. Or the one where you get the check and a letter telling you to cash it and buy gift cards with the money. This is just a fake check he received with absolutely no correspondence! Even stranger is that it was sent to his job!!!!