Voucher

Source: npc/jobs/1-1/merchant.txt

1. During Merchant Job Quest, take delivery work from Merchant Guildsman.
2. Deliver boxes to correct clients and return to guild.
3. Successful deliveries grant Voucher items (IDs 1073-1080).
4. All of them are named Voucher in item DB.
5. Turn vouchers in to complete the test and proceed job change.