What would you do if you were the owner of the car?

I was traveling alone when I checked into an old hotel in a town I'v never visited. I booked the cheapest hotel room I could find. At exactly 2 a.m. three knocks woke me. “Roy Gilbert, I know you're in there.” My blood ran cold. How did a stranger know my full name? When I opened the door, nobody was there. Only a folded note: “Check under your bed before you leave.”