I had this same thing happen two years ago. Since I was moving I seen no harm in sending a name and address. About a month latter I got a altered cashiers check, called american express(the name on the check) they told me the number was real but already had been cashed for a different amount. I then took it to our local FBI field office and they told me there was nothing they could do until the guy saw I still had the envelope with a US postmark, see they think the people running these scams are from accross the pond but he was intriuged to see a AZ postmark. My advice dont open it just call the FBI, the local police told me to throw it away!
