OK, I have been asking some questions to my local PO about this with the new rule changes, plus I have recently sent 2 very expensive pins overseas that I wanted better record of
Registered Mail is now $12.50 and is USPS trackable only (can not track online). Theoretically, it requires the receiver to sign for it, BUT that is dealt with on the local level, as the 2 I sent they were not made to sign.
If the package is shipped as a package internationally, not a large envelope rate, it is supposed to be able to tracked online by the Customs Number XX 111 111 111 XX. Mind you, to send one pin overseas or to Canada, that jumps the price from $2-$3 to $6-$7 per envelope.