It's hard* to find credible sources on this on the open web, if you read something like the Silk Road[illegal eBay for drugs, you pay with bitcoin] forums on t

It's hard* to find credible sources on this on the open web, if you read something like the Silk Road[illegal eBay for drugs, you pay with bitcoin] forums on tor, this is widely reported, and verified by self-proclaimed employees of the companies(ups FedEx). More convincingly vendors universally ship through USPS explicitly because they provide a warrant. Disclaimers: I am not a customer, and have not used the service, but believe that looking at the security methods used by those actively prosecuted is a decent way to figure out with precautions/security measures work. *though a quick google of ups open package on warrant will reveal many on dubious forums