Also known as couriers or delivery men, delivery boys deliver packages, documents, and other items to customers. They answer customers' questions and investigate any discrepancies with the delivered items.Also known as couriers or delivery men, delivery boys deliver packages, documents, and other items to customers. They answer customers' questions and investigate any discrepancies with the delivered items.Also known as couriers or delivery men, delivery boys deliver packages, documents, and other items to customers. They answer customers' questions and investigate any discrepancies with the delivered items.