The Finance Director shall keep, or cause to be kept, full and complete books of accounts relative to the combined system separate and apart from any other records of the village, showing in detail all money received by him or her with dates and sources and all matters pertaining to his or her office in a clear and methodical manner. He or she shall also keep such other books relative to such system as the Village President and Board of Trustees may, from time to time, direct. All such books, accounts and papers pertaining to such office shall, at all reasonable times, be open to the inspection of the Village President and Board of Trustees, any member thereof, the holder of any outstanding waterworks and sewerage revenue bonds, or any duly authorized agent or agents of such holder.