In view of the disparate transmission situation of the sources that are scattered in German, French, English and American archives, an academic study of art protection has largely remained a desideratum for research to this day.
Only the interest of the Russian director Alexander Sokurov in the subject of art theft and the person of Wolff Metternich prompted the family to deposit the estate with the VAR.
From September 1, 2016, the Federal Foundation German Center for the Loss of Cultural Assets in Magdeburg financed two project positions for the creation of a subject-related inventory.
With the documents from the estate of Franziskus Graf Wolff Metternich and their comparison with counterparts in other international archives, the structures and networks of art protection in the Second World War are made visible for the first time.
To counter the protests, counterbalance the destruction, redeem itself in the eyes of international agencies and regain its image as the land of culture par excellence, German propaganda created the principle of Kunstschutz.
The museum at Metz has put on an exhibition on the activities of its former German curator, the archaeologist Johann Baptist Keune, in protecting the artistic heritage of the Moselle during the conflict.
Their aim was ultimately to exile or murder their victims, and steal their worldly possessions, including any artwork such as paintings, drawings and prints, as well as furniture, antiques, books, tapestries, carpets and so on.
Other Nazi dignitaries, like Reichsmarschall Hermann Göring and Foreign Affairs minister von Ribbentrop, were also intent on taking advantage of German military conquests to increase their private art collections.
The art dealers Hildebrand Gurlitt, Karl Buchholz, Ferdinand Moeller and Bernhard Boehmer set up shop in Schloss Niederschonhausen, just outside Berlin, to sell the near-16,000 cache of paintings and sculptures which Hitler and Göring removed from the walls of German museums in 1937–38.
They were first put on display in the Haus der Kunst in Munich on 19 July 1937, with the Nazi leaders inviting public mockery by two million visitors.
What is unknown after these sales is how many paintings were kept by Gurlitt, Buchholz, Moeller and Boehmer and sold by them to Switzerland and America – ships crossed the Atlantic from Lisbon – for personal gain.
The men were responsible for entering private and institutional libraries in the occupied countries and removing any materials of interest to the Germans, especially items of scientific, technical or other informational value.
One of those officers was the antifascist Rodolfo Siviero, who transmitted his reports to the Allies via his partisan contacts and continued to hunt down and return looted and illegally acquired Italian artworks from Germany after 1945.
Ribbentrop, the German foreign minister, tried to get hold of Diana Bathing by François Boucher, whilst Hitler himself took part of Alfred Schloss's collection of 300 Dutch paintings for his personal museum at Linz.
German art looting also occurred in every state invaded and occupied by Germany, but especially Poland, Czechoslovakia, the Soviet Union, the Netherlands, Belgium, Luxembourg and elsewhere.