There are two different versions of the template included with the download. The one pictured above, with the OPEN windows, is designed for using acetate windows so that you can see through it, like a real telephone box. You might want to use this version with little lights inside it, and display it on a shelf or a windowsill.
The one pictured below, with the BLANK or filled in windows, is designed for using paper or card windows. You might want to use this version if you are intending it to be a gift box, and you don't want the gift to be seen inside!