Im not sure if this is darknet related, but appearantly LE either intercepted a package or it was actually delivered to the wrong address and then send the intended recipient a letter(pretending to be a citizen) saying his package of weed went to the wrong house and he can get it for a little extra money. Dude goes to meet the person and is arrested.
http://m.pilotonline.com/?cu=spreed%3A%2F5083579%2F5082641%2F32996357
Ouch.