HOW DO I KNOW WHICH KEY GOES IN WHICH HOLE. You don't. WHAT. THERE ARE NO LABELS. OR NUMBERS. OR ANYTHING? Nope. You just have to try them on every keyhole until one fits. THAT'S SO TERRIBLE. I LITERALLY CANNOT. EVEN THINK OF A SINGLE THING MORE TERRIBLE THAN THAT. Welcome to your quest. OK. I GUESS I FOUND ONE THAT FITS.