Exterior lock replacement and rekeying after property handover
https://atomic-wiki.win/index.php/Exterior_lock_replacement_and_rekeying_after_property_handover
After we handed over the keys, we realized the exterior locks were still keyed to the old owner's set. To secure the place, we had a locksmith swap out the deadbolt and rekey the knob so our keys work. It was a straightforward job, took about an hour, and now we can sleep soundly knowing no one else has access.