The CIA forgot about a bunch of classified documents stashed in the Rockefellers’ barn

In late 1989, the Rockefeller family faced an unusual dilemma: they wanted to give a barn away. For most people with their money and resources, this would be a relatively minor headache, but for the Rockefellers, the problem was a bit more complicated - inside the barn was a vault, which contained locked file cabinets that were filled with classified information, some belonging to the CIA.

https://www.muckrock.com/news/archives/2017/mar/06/cia-forgot-about-bunch-classified-documents-stashe/