When it is shown to the satisfaction of the state tax commission that there was no intention to violate any of the provisions of this act, the commission may return any property confiscated to the party and permit the party to affix the proper amount of stamps to any cigarettes, provided additionally the party pays all costs incurred and a penalty of twenty-five per cent (25%) of the amount of tax as well as interest on the total value of the stamps required to be purchased at one per cent (1%) for each month or portion thereof, from the date of the initial incident or occurrence of violations.