Which material is least likely to be stored in a utility box?

The material least likely to be stored in a utility box is soap. Utility boxes are typically designed to hold tools and equipment used for maintenance, repairs, or construction tasks. Common contents include items like screwdrivers, wrenches, and electrical tape, all of which are essential for performing various mechanical and electrical tasks.

Soap, while useful in a different context—such as cleaning—does not align with the primary purpose of a utility box. It is not a tool or equipment that one would generally need during repair or utility work, making it an outlier among the options provided. This leads to the conclusion that soap is the least relevant material to find in a utility box compared to the other practical tools listed.