1 in 15 coins come back from NGC Ancients as "Not Genuine". I only deal with auction houses that will accept NGC's determination of authenticity. The issue, upon which, I need some input on is that when I send a coin back to the auction house, I incur about a $30. to $60. shipping cost via USPS. I send the coin back Registered Mail insured. Has anyone a better (read: cheaper) way to send coins Insured internationally? Any helpful input would be greatly appreciated. Thanks.