My friend was extra careful and sent it to a PO box kind thing, with a fake name and throwaway email just in case. But he thinks that is overly paranoid: if the letter was intercepted (highly unlikely), there would be no legal consequences because there is no link between him and the purchase (therefore strictly speaking all that happened was that someone mailed him illegal drugs without his knowledge ;)).
It's a bad idea to send darkweb packages to a PO box, as the USPS will require a lower threshold of evidence to search the package. As it is they can't inspect your mail without a warrant, which is exceedingly rare for them to procure for a random package. Having it shipped to your home, although maybe somewhat nerve-wracking, is the simplest and most secure option in the United States (for now).
This is what my friends in the bodybuilding world have come to accept.
Yes packages get intercepted. But it isn’t the legal liability of an addressee for what is in some box that SOMEONE put in the mail. Otherwise it would be an amazing blackmail (nigh literally) tool to target any enemy.
