The Box Breaker is an item in Ratchet & Clank (2016 game), Going Commando, Size Matters. It is an OmniWrench attachment which allows Ratchet to destroy all boxes and breakable objects in his vicinity by performing a hyper-strike and slamming his OmniWrench on the ground.
The Box Breaker's functionality was included with the Bolt Grabber V2 in Up Your Arsenal. In Tools of Destruction and A Crack in Time, the Box Basher 2000 can be obtained, which has the same functionality.
Ratchet & Clank (re-imagined)
The Box Breaker was obtained on planet Gaspar after collecting all the telepathopus brains and turning them in to the scientist.
Ratchet obtained the Box Breaker after returning to the Megacorp Outlet, Oozla with the Gravity Boots obtained. He ascended a previously inaccessible grav-ramp within the store, and used a pipe to reach swamp monster II. After defeating it, he obtained the Box Breaker.
It was purchased from a Gadgetron vendor.