Controller cover

Does anyone know of a lockable cover for Rachio 3. Most thermostat covers are too small

Are you referring to something like the following (you can put your own lock on it)?

The location is indoors so I was thinking of a thermostat cover. But this will also work. Thanks for the help.

Ah, that make sense. You were more looking for nothing weatherproof, just lockable. I do not know what other options might be available.