In his regular column "Lessons from the History of Art Crime" Noah Charney writes on “Napoleon: Emperor of Art Theft” in the Spring 2015 issue of The Journal of Art Crime, edited by Charney (with Marc Balcells and Christos Tsirogiannis) and published by ARCA:

When Citizen Wicar, one of the key members of the art theft division of Napoleon's army, died in 1843, he bequeathed 1436 artworks as a gift to his birthplace, the city of Lille. Though most were works on papers (prints and drawings), this is an astonishing number. But there are two more facts about this bit of historical trivia that make it that much more surprising. First, almost all of these works had been stolen by him, personally, over the course of his service to the Napoleonic Army, in which he and several other officers were charged with selecting, removing, boxing up and shipping back to Paris art from the collection of those vanquished by la Grande Armee. Stealing over a thousand artworks is no small feat for a single person, even when with the sort of unrestricted access his position with the army allowed. Impressive enough, until we reach the second fact: Citizen Wicar had already sold most of the art he had stolen over the course of his post-war life, but still had those thousand odd pieces left over, to bequeath. In terms of quality, Citizen Wicar, who would serve as Keeper of Antiquities at the Louvre Museum, is the most prolific art thief in history. But it is his boss, Napoleon Bonaparte, who is often crowned with that title.

Here's a link to ARCA's website about access to The Journal of Art Crime.