The Resident Evil 4 square lock boxes in the Castle section need a special key called a Cubic Device, and you won't be able to open them without it. It's definitely worth doing - those five square ...

You’ve lost your trunk key or the lock is jammed. This kind of thing always seems to happen at the worst possible moment. If your truck is equipped with a power lock, the trunk will open automatically ...

The Square Lock Boxes are just another of Resident Evil 4 Remake's many puzzles to lay your hands on priceless treasure that you'll pawn to buy ever-greater guns for blasting cultists and monsters.