I understand your frustration. I live in a very rural area, before purchasing the home I live in now, I had rented a home prior to this house. I love to garden, so as my husband would prepare a section for me to garden in the yard, we discovered all kinds of stuff the previous person, or the owner, had buried. I thought I would lose my mind when we dug down and found all kinds of scrap metal including a complete washing machine!! They purposely buried these types of things to save them a trip to the dump. It was very disheartening.