The State Department ack**wledged Thursday it could **t find any record of part or all of 15 emails from Hillary Clinton dating from her time as secretary of state, copies of which have been given to US lawmakers. A stash of thousands of emails has been turned over to a congressional panel investigating the 2012 attack on a US mission in Libya by longtime Clinton confidante and friend Sidney Blumenthal. "The substance of those 15 emails is **t relevant to the 2012 attacks in Benghazi," the State Department official stressed, asking **t to be named.