What type of document is referred to as a "firm delivery book"?

A "firm delivery book" serves as a record of package deliveries. This document typically logs details such as the date and time of delivery, the recipient's name, the address, and potentially the condition of the package upon arrival. It is an essential tool for maintaining accountability and organization in mail processing and delivery services, ensuring that every package can be tracked and verified as having been delivered.

The clarity and accuracy in recording each delivery help prevent losses and resolve disputes regarding package whereabouts. This function is critical in ensuring customer satisfaction and maintaining service reliability. Other options, while related to various aspects of mail handling, do not encompass the specific purpose of tracking individual deliveries as accurately as a firm delivery book does.