A balance of money requisitioned from the unemployment trust fund under § 41-33-80 which remains unclaimed or unpaid in the benefit account and the benefit payment account after the expiration of the period for which those sums were requisitioned either must be deducted from an estimate for, and may be used for the payment of, a benefit during a succeeding period or, in the discretion of the department, must be redeposited with the Secretary of the Treasury of the United States to the credit of this State’s account in the unemployment trust fund, as provided in § 41-33-50.