The board of supervisors of the principal county in which any such district has been disincorporated, shall have the power and it shall be the duty of said board, if the board of directors of such district shall fail or refuse to return to said board the statement of said amounts as hereinbefore in this act provided, to ascertain the indebtedness, other than the bonded indebtedness, of said district at the time of its disincorporation, the amount of money in its treasury and the amount due it at the said time; said board of supervisors shall make provision for the collection of the amounts due to said district, for the closing up of its affairs, and any act or acts necessary for said purposes not otherwise herein provided for, shall upon the order of said board of supervisors directing the same, be as fully done and performed and with as full effect as if the same had been performed by the proper officers of said district before disincorporation, and said county shall succeed to and possess all the right of said district in and to said indebtedness, and shall have the power to sue for or otherwise collect any such debts in the name of said county, and all costs and expenses of ascertaining the facts hereinbefore mentioned, and all other costs and expenses incurred by the board of supervisors in the execution of the orders and duties of said board of supervisors provided for in this act, shall be paid out of the special fund in this act provided for.