Skin of leek, excretment of snail......

In my world, I don't always go for the pretties of the flower kingdom.  I was completely taken by the little tissue caps that split off to reveal the flower of the leek plant. As they dried I put them in the bottom part of an old silver salt shaker. When did the snail show up? There is something about the tarnished silver and brown transparent tissue of the leek "caps" that is very appealing and I have kept these caps all summer. Need to take some better photos before letting them go.