Automated Lockboxes with unique codes

[Pavlos Kasselouris]

I want to automate the showing process, by having prospects registering (sending maybe a copy of the DL) and providing them a unique code within a specific time window to go and see the property. 

I know some big investment funds do it this way. I don't mind being present during showings to vet the prospect because the time consumed is considerably a lot and only a few will actually be really interested. At the end of the day whoever I decide to put in the property will be thoroughly vetted. Plus rental properties are empty...

Do you have in mind any lockbox providers that can do this?

So far I found only the "codebox"