It is indeed surprisingly hard to make an airtight container. A ziploc bag doesn't work. Even setting your drugs in a block of concrete does not work. What does work is enclosing that block with a layer of melted lead and letting that cool down. Of course that might be suspicious in other ways (and expensive).
Had they not found that, would they have a case if they could only prove someone was sending him drugs in the mail?
Having thousands of SMSes discussing what drugs you have for sale might be a bit harder to explain.
Oh, so I could get someone arrested by blatantly mailing them drugs? Surely a court would require proof the receiver initiated and intended the drugs to be shipped.
Also you'll have to spend a huge amount of money on a lawyer, and most likely will be refused bail so could languish in pretrial prison for a year or so.
That's why you never sign for anything if you don't know what it is, in court they claim because you signed for it you ordered it
But if you have unexplained bundles of cash, some drugs, a bunch of weapons and two mobile phones with thousands of messages discussing drug discussions then you might be SOL.
https://metrics.torproject.org/users.html?graph=direct-users...
All BS, of course. Most such people are charged because Customs open a percentage of all packages entering the country and have a look inside. And it's not necessarily at random; the method for reliably fooling a good sniffer dog has yet to be devised.
Until someone solves the problem that you can't easily do dual key encryption on molecules, people are going to keep getting busted by old fashioned customs and police work.
If he made a mistake, it wasn't some Tor-related misconfiguration. It's that he didn't bribe the right Customs officials.