For someone like me who has worked in the department and issues with these letters when at my old job... To tell you the thruth, they send a letter back saying that the corresspondence has been sent to the officer in charge of what ever station it was near and then it basically just gets thrown in the bin!!
Its basically like when we get junk mail.. you sometimes read it just to see what its about. If its interesting you read on.. If its not you chuck it in the bin..