Sold a cassette to someone in Guam. Which is a US possession and serviced by the USPS. I selected First Class as it was 5 oz and cost $5.20, which is crazy high but it is 'out there'. The clerk asked what it was and I didn't say anything to get me in trouble. I would have had to fill out a customs form even though it's in the US. He said if you mark 'paper only' on the box it would go without a form like regular FCM. So that's what I did. There you have it. Shipping to Guam (USA 96915).