I don't think so. I can easily imagine doing this kind of thing. I love to hide things. I left poems under the tomettes of my chambre de bonne in the 16th. I wrote notes on the baseboards of my room when I was kid. When I make clothes, I often write things in the lining, on the interfacing, with a sharpie. I went through a phase of leaving pressed flowers in library books. You have drafty cracks big enough to stuff rags in? That sounds serious.