(2) The board may by resolution entered on its records cancel any bonds which may have been voted or issued which have not been sold or deposited as security for funds advanced or to be advanced, and which the state, United States or any person has no claim to or equity in. After such cancellation, the bonds shall not be sold or otherwise disposed of; they shall be invalid and of no effect; and the board may not replace them without authorization of the electors. [1965 c.623 §22]