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The lockbox was for the packages themselves, not for the keys to the house.

Oh boy, took your comment to finally get this. I take lockbox to mean the thing you put on the front door itself to gain access to the house.

It means that, too - real estate agents use the term for the little key box they use to let other agents see vacant houses.

Personally I'd use the term "locker" to refer to a box placed outside in which to store packages.