Any moneys collected or received by the board pursuant to the provisions of this order during or with respect to any season or year may be refunded on a pro rata basis at the close of such season or year or at the close of such longer period as the board determines to be reasonably adapted to effectuate the declared policies of this act and the purposes of the marketing order to all persons from whom moneys were collected or received, or may be carried over into and used with respect to the next succeeding season, year, or period whenever the board finds that the same will tend to effectuate such policies and purposes.