To be honest, it seems unlikely you'd be prosecuted for it unless you live in some crazy tough-on-drugs part of the country. People order all sorts of crazy recreational drugs from the dark web that end up getting seized by customs all the time. Over on those forums, most of the people end up with a letter from customs saying it was seized and telling them not to do it again. You could always just claim you didn't order the package and it was some kind of scam or something.