Key Management - Lockbox Options

[Dan Bosak]

How are you handling all of the keys for various properties?

I have a lockbox key cabinet in the office but it's not the most efficient option since we end up running keys around and I find that keys too often are mislabeled or missing.  I'd like to add a secure lockbox to each property where a spare key can be stored that we can easily access for emergency, maintenance, etc..  

I've mounted simple master-lock combo lockboxes to foundation walls at a couple of my properties but am not sure if that is the best option.  I was thinking about adding knox boxes to each property since I can have a single master key for each, but at $200+ each, that adds up quickly.

Any other suggestions for how to more efficiently manage the keys and/or type of secure lockbox option for this scenario?