When the board is convinced by clear and unequivocal proof that a warrant of the district, without bad faith on the part of the holder, has been lost, destroyed, or so mutilated or defaced as to impair its value to the holder, and when such instrument is capable of being identified by number and description, the board may issue or cause to be issued a duplicate thereof having the same maturity, bearing like interest, and having the same number as the warrant proved to have been lost, destroyed, mutilated or defaced.