You will find in PC CADDIE under Sales/contribution types/articles/print…/lists/voucher list the complete voucher list of vouchers sold and redeemed to date, including remaining balance and cancellations.
Vouchers that have „expired“ must be cancelled manually with an offsetting entry via the cash register. In principle, the general legal principles and expiry periods for voucher administrations must be taken into account here.
See also Voucher management: Voucher management