Stanton had a bad habit of making famous documents disappear. He was also the last known owner of the infamous Dahlgren Papers that were found of the body of a union soldier and reportedly detailed a plot to assassinate Jefferson Davis. The Dahlgren Papers' custody is well documented throughout the war and after it until they were shipped with confederate government records to Washington, D.C. Upon arrival in Washington Stanton immediately sent for them and took possession. They were never seen again.
Come Retribution:
The Confederate Secret Service
and the Assassination of Lincoln
by William A. Tidwell,
with James O. Hall,
and David Winfred Gaddy