Intrigued by the Mystery

Paul was intrigued by this mystery and, since he’s a retired 61-year-old IT support engineer, he had enough time on his hands to decipher the hidden message on the box.
You see, he explained in a later interview that he loves watching the show “and as soon as I heard them say ‘we can’t solve it’, I thought: ‘I bet I can’. It was worth a try, at least.” So… he did! What was the message?