Many years ago when I was in the Navy, we could send and receive classified documents using registered mail. It may have been more secure back then but it still seems secure when I use it today. There are many hoops to jump through when using it. The one that is a pain for me, is finding "paper" tape to cover every (all) seams in the package. They require a paper tape so they can stamp it liberally making it obvious if it is tampered with (opened). That paper tape is almost impossible for me to locate but I understand why the require it.
Years ago, a fine gunsmith advised me to always use registered mail. I have used it many times and never had a problem. Its not the cheapest way to ship but it may be the most secure.
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