As exploration continued within occupied France, and by order of the Führer, a list was created which included all of the great works of art in France, and the German Currency Unit began to open private bank units which contained countless collectors' property and possible items on the list. The owner of the vault was required to be present. One particular investigation of a vault was that of Pablo Picasso; he chose a rather clever tactic when soldiers searched the contents of his vault. He packed his own artworks with countless other artists’ works of his collection in a chaotic manner, with the result that the investigators thought that nothing in the collection was significant, and took nothing.