Mystery sweeper

You must have come in between errands. We had just moved in when I left that fall morning, knowing I'd be coming home to sweep up the big pile of leaves that had gathered in our driveway overnight. Snow was coming and time was of the essence. Imagine my (JOYOUS) shock when I came home to find ALL the leaves gone! Had I been mistaken about the leaves that were there? I learned from our new neighbors there was someone who has this reputation for doing Acts of Kindness. I haven't met you yet, but I'm grateful you're my neighbor. Thank you!