Mice droppings are a clear indication of mice activity even though there is no mice to be seen. Mice are elusive and often come out of their hiding when things are quiet. When we place a wild life camera we often see 1 or 2 mouse coming out for about 10 minutes at the beginning of the night, and sometimes another 1 or 2 time during the night.
Inoculand pest control mice service relies primarily in placing bait down. The bait boxes have a dual purpose. After a certain period of time you can inspect the bait level and confirm if there was any take at all, and in which area or direction the mice activity is stronger.
However mice droppings are but the result of past activity that could be from the very morning, or from many days ago. In principle, whatever mice droppings you would find need to be removed as past evidence, and the area need to be checked for the appearance of new mice droppings. If new mice droppings are noticed, then there can be no doubt that you are suffering from an ongoing mice infestation.
Another approach that can be easily be implemented is the use of tracking dust that can be sprinkled in the area where droppings were seen. If any mice are going through this particular area, they will leave a trail that can easily be followed with a UV light torch. This will also allow to highlight the way the mice are traveling through your home.
This is of particular importance when it come to mouse proofing inside the property but also outdoors. Mice are incontinent and mice droppings fall rather randomly wherever the go. But mice do go more often through certain holes to gain access into the property. So it is frequent to find more mice droppings near an entry point and along their runs.
Most of the gaps indoors are found around the pipework as they go through the floor and walls. They can be rodent proofed to keep the mice out of the living space. But the mice would still be within the walls, or under the floor boards. In the case of detached houses, the rodent proofing can be done at outer wall level. You can cover the air brick with rodent proof mesh and seal holes at masonry level with sand and cement.
So whatever strategy you follow, pest control mice treatment or rodent proofing, the presence of new mice droppings is the ultimate evidence of mice activity regardless you see them or not.