before you run to your local locksmith and try for 3 replacements, look at the front of the lock, if theres numbers you dont have to take it out at all, just take the number with you. they will be able to cut a key from the number. if for some reason they tell you they cannot, send me a message and ill find you keys. if theres no number than yes, the lock needs to come out and be brought to a shop. sometimes its not as easy as just swapping out the cylinders in a tool box with a regular cam lock (what you would get if you went to a locksmith for replacements) i have only been able to swap out locks on a tool box with regular cam locks 2 times. most of the ones ive seen have a special tailpiece thats pressed on and connects to linkage that locks all the drawers yada yada... hope this helped some, and let me know if you need a hand