What are good Key boxes that can be integrated with OwnerRez?

One of my properties is a much older building, and the doors in the property make it impossible to fit a standard modern electronic lock on it. I currently use an Igloo Home Key Box, but I find that its remote control is very unreliable. I can generate algo codes, but those are 9 digits long, making it more difficult for guests to navigate the keypad and unlock it.

Does anyone else have a key box solution that integrates with OwnerRez over Wi-Fi? Where I can automatically program the key box with a standard last 4 of the phone number code, the way you would with most other electronic locks?

I am looking for the same.  Did you find something?