There are several categories of packages shipped through UPS’s courier package services, some of which have a more straightforward form and require only standard delivery. Some others are required to sign through the recipient of the package. And there are some factors behind the need for such a mandatory signature.
The very first factor is the need for signs by the shipper. In some exceptional cases or general business transactions, the shipper needs to completed by the package recipient’s signs, who is the other customer.
Other factors can occur if the package contains some very high-value items, subject to any danger. Any form, those packages also need to be completed by a mandatory signal from the recipient of the box. UPS shipment reference