Famous Cases of Art Theft

From Wikipedia:

Quedlinburg medieval artifacts (1945)

In 1945, an American soldier and former art teacher Joe Meandor stole 12 medieval artifacts found in a cave near Quedlinburg which had been hidden by local members of the clergy from Nazi looters in 1943.

Returning to the United States, the artifacts remained in Meandor’s possession until his death in 1980, making no attempt to sell them. When his older brothers attempted to sell a 9th century manuscript and 16th century prayerbook from Meandor’s collection in 1996, the two were arrested. However, the charges were dismissed after it was declared the statute of limitations had expired.