Yeah, you gotta determine what is more likely 1) the landlord didn't change the locks between tenants AND there's a great "key copying conspiracy." Or 2) The

Yeah, you gotta determine what is more likely 1) the landlord didn't change the locks between tenants AND there's a great "key copying conspiracy." Or 2) There's an emergency requiring your landlord/maintenance to enter the premise when you aren't home. I know which one I find more likely, but you do you. OTOH Probably most landlords won't mind you changing the locks as long as you give them a copy of the key.