noun “lockbox”
 singular lockbox, plural lockboxes
- a box with a built-in lock, used to keep valuables safe 
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 She kept her important documents in a lockbox hidden under her bed.
 - (in real estate) a small box that holds keys to a property, accessed with a code, allowing agents to show the property 
The realtor entered the code to open the lockbox and retrieve the house keys.
 - (in banking) a service offered by banks to process payments on behalf of a company 
The business used a lockbox service to expedite the collection of customer checks.