In the original message he clamed that he was sent pot in the mail. The law also states that if you had no knowledge of the illegal drugs being sent to you, you can not be prosecuted. You have to make them feel that you did not have any knowledge and that some wacko friend had sent it or someone you do not know and they did it as a joke. If you can convince them (police or customs) good chance you will be off the hook. Of course in his case they also found hash in his apartment so a little more difficult to prove that he had no knowledge. But not impossible