Call the local police and file charges for felony level interstate fraud.
I did try call Florida police after a Spyro Kopreos from Pensacola Florida scammed me on Ebay.
US police is shit to be honest they refused to take a report on the telephone.
What am i supposed to do!? Buy a airline ticket and fly there!?
So i mailed him almost 1 pound of marijuana that had budrot and was unsmokeable

No vacuum no nothing just straight down into a mailing bag.
That way i think he got attention of the police anyway..