Library officials said their research determined Godzilla Heads gum dates from the 1980s and the Hamm's beer cans don't include health warnings that were required from 1988 on, leading staff to believe the snack stash is more than 30 years old.
"It looked like somebody had just stashed it there and maybe thought they could get it later ... but there was no way to get it out," library director Erin Wells told CNN. "There were probably six beers that they bought and there was only five that we found so they might not have been thinking straight when they did it."
The City of Walla Walla said the "artifacts" were transferred "to another city facility."
"The abandoned relics now reside in the Sudbury Landfill," the city said.