Mailers of high dollar items would not agree. USPS Registered Mail is the most secure shipping in the world, providing an unbroken chain of custody from sender to receiver, and whatever level of security is necessary to protect the goods. The Hope Diamond was shipped to the Smithsonian via Registered Mail.
Very interesting to know... I wonder how they are about paying on insurance claims.
A story if you will indulge me. It will help me explain my earlier comment.
About a year ago I shipped a sword to California. I sent it via priority mail with insurance and delivery confirmation. About four weeks later I was contacted by the buyer asking me where the heck his sword was? Heck I didn't know, I got on the USPS site and looked up the tracking number. The site helpfully told me that there was no such number in the system despite the fact that I had the number right there.
So I took my receipt, the insurance slip and the delivery confirmation slip to a local post office and asked them to look it up. The clerk went rummaging around on the computer and then told me the package had been delivered. I asked if I could see the signature and he told me that they did not have it available there. So basically at this point I had the post office telling me the item had been delivered and the customer telling me it had not.
Hmm what to do? Well, I got on the internet and looked up the post office responsible for delivering to the zip code of the buyer and called them directly. I asked them if they had the signature from the delivery. A very nice lady there faxed it to me even though she was not supposed to. She also gave me the phone number of the supervisor of that post office. When I got the signature in hand sure enough it was not the signature of the buyer. When I asked him about it he noted that it was not even the signature of anyone he knew.
Next I called the postal supervisor. I explained the situation and that I had the signature in hand that did NOT match the signature of the buyer. He did some digging and finally came back and told me that the signature was that of the mail carrier on that route. I pointed out that since the mail carrier was not the buyer that something was a bit amiss. He talked to the carrier when they got in for the day and they told him that they and the customer had worked out an arrangement where the carrier would sign for packages and then leave them on the steps. I asked the buyer if that was true and he said no. I told the supervisor I wanted to see this agreement in writing which of course neither he nor the carrier could produce.
At that point I filed an insurance claim. I filled out the insurance claim form as required as well as providing copies of all receipts and a copy of the singnature along with basically the explanation I provided above. About three weeks later I got back a letter from the postal inspector telling me that since the item was delivered and signed for I had no claim.
Never mind that it was not delivered to the buyer, and never mind that the signature was not that of the buyer. Since the post office had delivered it to SOMEONE they were washing their hands of the matter.
As it turned out this story had a happy ending for me (the sword magically appeared shortly after I got the letter), but I have come to the conclusion that USPS will never pay on an insurance claim so you use them at your own risk.
Perhaps this is different for some of their other services. I would rather not find out.