I have a Ford KA 52 reg, the boot lock is changed and the keys are lost?

how can i change the lock?
The car was involved in an accident and the previous owners had to change the lock, before I brought the car they lost the set of keys for the boot. I have 2 keys for the ignition doors, but I want to get a 2nd hand boot lock and key. How would I go about changing the lock on the boot lock?
 
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