Hallo - we are still having a problem. Those voles are happy in our garden/around the house and don't seem to find their way into the black boxes. What should we do to assist - we have moved the boxes to better locations - or does a knowledgeable person have to check things out? Kindly give us instructions - these little creatures are not distracted by our presence. At this time I cannot give a rating. Thank you, Julianne.