> Not sure what sort of agreement would be made by finding an address of a piece of paper on the ground, and then knocking on the door there. As usual, these p

> Not sure what sort of agreement would be made by finding an address of a piece of paper on the ground, and then knocking on the door there. As usual, these problems have already been addressed in contract law. What you are describing is an "invitation to treat", which is specifically not a contract. https://en.wikipedia.org/wiki/Invitation_to_treat https://en.wikipedia.org/wiki/Invitation_to_treat