Question

There's a book in one of the box.
Is this sentence correct!?

Answer 1

no it's wrong. the sentence should be..
There's a book in one of the boxes.
hope it will help you

Answer 2

Hello mate here is your answer.

This sentence is actually not correct. It should have been,There's a book in one of the$\bf\underline{boxes.}$

Hope it helps you.