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. Similar to the Wayshrines you find throughout the village, these chests require a specific device if you want to open them up.
You'll also have to solve a little puzzle to unlock each in Resident Evil 4 Remake, but that's no surprise considering Salazar's riddle-strewn castle makes the village look like a total paradise. Here's how to find the Square Lock Box key, solve the puzzle, plus all of the lock box locations, and what treasure they contain.
