Key Blank for Mailbox Lock with Indicator The Uncut Mailbox Key (BD861) is a key blank specifically designed for mailbox lock with indicator. This key blank is perfect for locksmiths and key cutting professionals as it allows them to easily cut and create a custom key for their clients’ mailbox locks. This key blank is compatible with locks from popular brands such as Home Depot and Lowes. It is made of high-quality materials and ensures a secure fit for the mailbox lock.old at Home Depot and Lowes