The phrase "magical box" refers to an object that seems to have special, mysterious, and sometimes extraordinary powers or abilities. It represents something that is enchanting or creates wonder and awe. Full definition
She believes a small magical box holds the key to how she might achieve that goal. (talkiegazette.com)
Donald Judd created magical boxes of colour. (theguardian.com)
Several of us got together to talk about Light Fall on Nintendo Switch, a platformer where you use the power of the Shadow Core to spawn magical boxes under you feet that allow you to face challenges and create your own path through each level. (nintendofuse.com)