Unlawful Metal Detecting

At my mom's home when I notice two people who are metal detecting on the neighbor's property. Being close to those neighbors, I ask them if they have permission and they said they did not. I then notice that they were drilling holes through a deck (that is not there in the wakened world) to get to silver coins. After being confronted and informing them that I'm calling the police, they approached me and sought to argue their case. They reasoned that the owners should be happy to get a few silver coins from them and that they had done them a favor by finding them. Some unknown, unmemorable term for their kind of coin they were finding was used but I cannot recall it now. Eventually, I speak with the owners of the home and they are irate, speaking to me through their window.