as chief of protocol at the white house. >> rosenstein: but in fact, there is no evidence that barry landau any white house, or had any of the relationships he claimed to have, or indeed had any legitimate job at all. >> simon: the landau case, and a few others, let law enforcement know they had a problem they hadn't really been aware of until very recently. >> paul brachfeld: every institution now that has collections is threatened. we all know that there is a major threat and it's getting larger. >> simon: former secret service employee paul brachfeld is the inspector general of the national archives. he runs the tiny and little- known archival recovery team-- armed federal agents and historians who, along with the fbi, go after stolen national treasures. now, landau, was he a good thief? was he a good con man? >> brachfeld: from everybody i talked to, he was a master thief. because he did it over a duration of time. he shopped. he got what he shopped for. >> pelley: a trusted researcher and regular at libraries around the country, landau's strategy, along with his accomplice, they conque

>>> you focus on barry landau, this con man, he was also able to get his picture taken with a numberpresidents. who is he? >> he's a fraud. he's a super fraud. he convinced presidents, everyone, he was an expert, that he knew everything about presidents and presidents consulted him when they had a big affair coming up, some kind of royal wedding or whatever. they would go to him for advice on how to do it. and he wrote a coffee table book on presidential memorabilia. it was endorsed, incidentally, among other people, by mike wallace, who wasn't a guy who got conned very often. >> go ahead, sorry, norah. >> i was going to say, it really is incredible what a con man this man, barry landau, is. it's not just him, these documents were stolen by many other people too, right? >> he's just the biggest so far. they don't know what's been stolen. the records are so antiquated and no security, virtually no security in these places. you'd probably have a better time stealing a document than pinching an apple in a supermarket. >> look at this picture. this is a picture of you, we're going to see