The piece is currently in the archives of the Moravian Museum, in the Czech city of Brno to keep it from being stolen by Nazis. The original owners–the Petscheks family–were once the richest family in pre-WWII Czechoslovakia and fled the country to escape the Holocaust. The 4th movement of the string quartet in B-flat Major, op. 130 has been at the museum for over 80 years.
Source: Beethoven Manuscript Saved from Nazis Returned by Museum