The following references International Registered Mail only (not domestic Registered Mail or any other mail carrier or shipping service). If you have questions about other carriers or shipping services, please contact the carrier.
International Registered Mail coming into the US may no longer be systematically scanned or signed-for each time the package changes hands.
International Registered Mail has always been considered to be the safest method of international shipment. However, apparently the USPS (quietly) changed their policy regarding the treatment of International Registered Mail about 2 years ago, as a cost-saving measure. This means that a Registered package can now be shipped between post offices without being scanned or left at the addressee's door without a signature. Of course, they forgot to mention this change to their customers, who are still (mistakenly) relying on International Registered Mail as a totally secure method of shipping important packages. Now, if an internationally shipped package (sent via International Registered Mail) goes lost, the US Postal Service may no longer be able to account for it. Unfortunately, this is likely to have serious ramifications for people buying/selling Rolex & other high value watches via ebay, TZ & other online sites where watches are bought/sold internationally. (To the best of my knowledge, this USPS policy change does not affect domestic Registered Mail (Registered Mail sent & received within the US).)
Sadly, this is yet another example of why governments can no longer be trusted.