I'd guess you could use assigned names and location patterns to get a decent sense of what the tile is attached to. If it's on someone's keyring for example it'

I'd guess you could use assigned names and location patterns to get a decent sense of what the tile is attached to. If it's on someone's keyring for example it's probably outside as much as their phone is. Then if the user has denied location tracking on their phone it becomes available through another route.