The site made headlines in January 2008, when thousands of artifacts from the Ban Chiang and other prehistoric sites in Thailand were found to be in the collections of at least five California museums, including the Los Angeles County Museum of Art, the Mingei International Museum, the Pacific Asian Museum, the Charles W. Bowers Museum, and the UC Berkeley Art Museum. The complex plot functioned as a crime ring and involved smuggling the items out of Thailand into the US, and then donating them to museums in order to claim tax write-offs. There were said to be more items in US museums than at the site itself.

https://en.wikipedia.org/wiki/Ban_Chiang