 As director of the Offenbach Collecting Point from May to November 1946, Bencowitz developed an innovative system of identification and sorting in order to aid the restitution of artworks and cultural artifacts.The Bencowitz system of identification was based on photographic records of the ex libris – bookplates, stamps, and other markings – found in each book.The photographs were then indexed by country and sorters were assigned and responsible for three or four ex libris.