When cropping images of rectangular shapes, such as a box, very often you will have to choose whether to leave some space around the box, or to cut away part of the box, due to the perspective nature of the image.
This tool allows you to place 4 handles individually on each corner, and will then warp your image into a rectangular shape displaying only your box.
The app is free to use and require no account or other setup, just install and enjoy.