If you weren't depressed before ...
"It's so precious that I put it in this metal case and keep it in my lockable metal cabinet" ... with a sign saying "Beware of the leopard"
It's already partly possible just by monitoring cell, WiFi, and Bluetooth signals sent out by mobile devices. They don't have to be connected to a network as there're identifiable IDs in these signals. Then add a connected, authenticated, work device that spends most of the day next to a personal, unconnected device and a pretty good assumption can be made of where you are if the work device is left on the desk while you 'take your ease'.