In the 1980s, someone stashed some beer and gum behind books at the Walla Walla Library in Washington State. The library is closed due to COVID-19 and undergoing renovations. From CNN:
During the demolition three weeks ago, five full cans of Hamm's beer and an opened pack of Godzilla Heads gum was found in a disintegrated paper bag, Wells said. Facilities Maintenance Specialist, Luis Cuellar found the odd treasure when he removed a seven foot tall corner panel on some open top shelving believed to be original to the 1970s building.
I bet the owner will be disappointed when they return for a drink and chew.