A while ago saw someone who was working in the tracking space said the following.
For stolen items you don't want to track them. You want to be able to ask them where they are. The advantage is you can make a locator that doesn't reveal itself by transmitting. And it doesn't waste power receiving gps signals. You could literally have a device that runs for years on a AA battery.
The reason you don't see these on the market is because the people that fund products want to sell location data.
replies(2):