Is box of monkey a collective noun?

A "box of monkeys" is not a collective noun. A collective noun is a word used to refer to a group of people, animals, or things that are considered as a whole. Some examples of collective nouns include "flock" for a group of birds, "herd" for a group of animals, or "team" for a group of people. "Box of monkeys" is simply a descriptive phrase used to refer to a container containing multiple monkeys, and it does not function as a collective noun in this context.