According to another article, they just slipped through the cracks on the floor from time to time and accumulated over the years. https://www.nationaltrust.org

According to another article, they just slipped through the cracks on the floor from time to time and accumulated over the years. https://www.nationaltrust.org.uk/visit/london/sutton-house-and-breakers-yard/lost-by-schoolgirls-a-display-of-17th-century-papercuts https://www.nationaltrust.org.uk/visit/london/sutton-house-a... I imagine the debris also included coins and the like.