As a basic measure, a translucent film would be easy enough beginning.
Any additional physical barrier that comes to mind?

Sockeye wrote:Building a wall is an option, but messy and expensive.
I am thinking of translucent film on the panels and security system as a bare minimum.
Shutters or crimsafe screens are a second line possibility.
Mattraff wrote:How about hiding the safe behind a false cupboard so it just looks like storage.