I recently noticed tiny small white droppings in the garage and a few around the house. I have no idea what they are but they keep appearing. They are very small and hard like rocks. I live in Houston, TX could they be snake droppings? We did bring in empty use boxes from another house. Maybe something was in there? Any idea would be appreciated because I'm frustrated at this point. My pest control guy doesn't know what they are. And I'm certain they are not rocks since that I clean them up in the garage and pop up again. Thank you.