answer:In the first case there it’s not your fault if you didn’t notice it. In the other two cases. Anything of that nature that I see lying around near my house, in the street, sidewalk, etc. I just pick it up. Is my responsibility? Not really I guess, but I pick up anyway. If I notice something far down the street I don’t go after it. I might if I was absolutely sure it was my trash from my bin otherwise, someone else will pick it up. It’s your neighborhood; do you want it to look trashy?