If you live in a community where a key is needed for your mailbox and the previous tenant did not leave it (usually in a kitchen drawer or on the counter), you will need to contact the post office to get a new one. Those mailboxes are owned and operated by the post office so we can not help you with it. Usually there is not a fee for getting a new key if you tell them you just moved in. If there is still a fee we can charge the previous tenants security deposit for loosing it and then give you a credit towards your rent, but only if you send us a receipt within one week of your move in date. Emailing the receipt is the best way to turn it in. Just make sure your name and address is on it with a description of what it is for.