I gave a good thought about it, and seems like I was just around a solution: what about a pet detector trinket! When equipped it shows pet markers on map. Since detectors are too high tech for crafting from animal parts and plants, it could be some rare/unique material that JuiceBox can detect using technomagic!
I had a whole paragraph about failproofness but I seem to have discarded it. Long story short, (math lingo ahead) unless "failing" is formally defined, it cannot be proven infalible. Formal definitions are hard, and complex systems are prohibitely expensive to define this way. Testing only detects presence of errors, never their absence. Therefore, no amount of testing proves failproofness. The tests done in Crashlands were mighty useful, but since the testers are game-savvy, lateral thinking and unusual behaviour were not verified quite as well. Which is not a problem, but this things happen, and it's nobody's fault. Managers don't understand this, unfortunately.