Hinds County Circuit Judge Tomie Green on Wednesday ordered five men who worked at the mansion before being pardoned to check in every 24 hours.
Green issued the order based on request from Mississippi Attorney General Jim Hood, who said Barbour might have violated the state Constitution by pardoning inmates who may have failed to give sufficient public notice that they were seeking pardons.
Authorities say the following men have been located or called the Mississippi Department of Corrections: convicted killers David Gatlin, Anthony McCray and Charles Hooker, and convicted robber Nathan Kern.
Corrections officials have not yet heard from Joseph Ozment.