The sting was on. . .

Washingtonpost.com  National Archives staff members became suspicious of Sandy Berger, and set up a method to track documents to see if they were being taken, according to the Washington Post.

They devised a coding system and marked the documents they knew Berger was interested in canvassing, and watched him carefully. They knew he was interested in all the versions of the millennium review, some of which bore handwritten notes from Clinton-era officials who had reviewed them. At one point an Archives employee even handed Berger a coded draft and asked whether he was sure he had seen it.

At the end of the day, Archives employees determined that that draft and all four or five other versions of the millennium memo had disappeared from the files.