"number of boxes" is correct and usable in written English.
You can use it when referring to the amount of boxes that there are. Example sentence: I was surprised by the number of boxes in the storage room.
Nigel Pearson may also tick a number of boxes.
As online shopping increases, so do the number of boxes being shipped.
No one-trick pony, the restaurant checks off a number of boxes.
The authorities took a number of boxes of materials from Mr. Williams's home.
The problem of finding the minimum number of boxes to tile a network is known as a NP-hard problem.
In its original form, stamp scrip was a piece of paper on which a number of boxes were printed.
Reuters charges $800 to $1,200, but discounts the rate depending on the number of boxes a customer uses.
Reducing the number of boxes allowed for larger numbers of people to be into the same volume of space.
Moving schools isn't an option: curriculum changes and Ofsted's rules apply everywhere and no one can escape the ever-growing number of boxes to tick.
A static profile contains facts like age, sex, address, the number of boxes of detergent the person buys in a month, or specific personality traits.
The small number of boxes at the Academy was at the heart of the problem: Belmont could not satisfy the clamor of wealthy New Yorkers for additional boxes.
