Sorry I’m a little late to the conversation.
To all and Mark,
I actually had the privilege of attending the first panel that Mark posted when I was an intern at the Smithsonian. It was fascinating and informative. At the time I was relatively new to the archives world, and like most of the public, tended to think of these types of thefts being perpetrated by outsiders. It was surprising to me how many of these thefts were actually perpetrated by academics, scholars, and even museum and archives professionals.
I would definitely recommend watching this video, even if you think your institution has nothing to worry about. And for those who are looking for some solutions and preventative measures, some of the practices described can be put in place at a smaller scale at any institution.