Same thing, they send you a big check, you deposit it, the bank makes the money available even though the check didn't clear, you send the money, the check bounces and you are out the money and the bank fees. If you don't pay the bank back they file criminal charges against you.
The USPS postal inspectors would like to see that check and the envelope it came in.
Their jurisdiction is all over the USA.
http://ehome.uspis.gov/fcsexternal/default.aspx
US Postal Inspection Service