[Hcb3200]

take your locks and see if you have pins that match.

So lets say you have three locks with 3 keys.
But each of those locks has at least one pin that matches one key.
Remove the pins that don't match a key.
So it may be pin 1 on one lock stays, pin 3 on another pin 4 on the third.
One key works all locks just used a different pin in each one to unlock.
If you lucky.

Or do like a friend of mine did. Just pulled all the pins.
One key work for all in fact any key that would fit in the lock would.
Heck even a screw driver did.
He figured what are the odds now days someone has a key small enough to go in the hole. Most people have key fobs or some double sided key to large. and if someone shows up with a screwdriver they are getting in anyway key pins or not. if they wanted what was in the glove box they were getting in anyway not like they are the strongest locks. He just put a small switch under the dash that cut the power to the coil. And only used that if he was somewhere where the truck was going to out of his site for a long time.

Plus how many people even know what a three on the tree is much less how hot wire a truck now days. if they want it that bad that is what insurance is for. He just never temped anyone by leaving something they want on the seat. "Locked" his door just to keep the curious from opening it.