I have been picking up these things up off peoples lawns left and right this season. In just the eight weeks that we have been mowing I have already picked up over 21 of these and not one has come from the same property. Several of them have rattled around under the deck before I knew they were there but most were spotted in thick grass before they were ran over. I used to just leave them on the grass but they never seems to get picked up but rather kicked around a little causing the same potential hazard the following week so now If I see one on the lawn I hold onto it. With so many of these things laying around I would be scared to death not having any liability insurance.