Which type of insurance covers loss of property while in a messenger's custody?

Transit insurance is specifically designed to cover loss or damage to property while it is being transported from one location to another. This includes scenarios where property is in the custody of a messenger or any other mode of conveyance until it reaches its intended destination. The focus of transit insurance is to safeguard the property against potential risks that can occur during transit, such as theft, loss, or damage due to accidents.

Comprehensive insurance, on the other hand, typically covers a wide range of risks but is often associated with automobile coverage and does not specifically address property in transit. Casualty insurance generally includes liability for injuries to people or damage to other people's property, rather than the property itself while in transit. Property insurance typically covers losses related to damage or theft of property at a specific location, rather than during the act of transportation.

Thus, transit insurance is the most appropriate type of coverage for property loss while in a messenger's custody, making it the correct choice in this context.