> If they were to commonly transport high value goods, theft would be a huge issue.

That was my first thought as well. Get a van and a sledgehammer and wait a few blocks away from their depot in the morning. Sure they could phone home, but what is the cost of maintaining a staff to protect the robots vs. just having the staff deliver things.

Reminds me of a friend who was a Marine Biologist. Their lab spent a lot of money to get an underwater probe that could go around and take automated readings based on a map. But the probe cost so much money that they had to follow it the whole time in a boat to make sure it didn't get lost.