I parked at the McFadden Plaza lot and walked my dog up Curry St., around the Nugget, and back down Carson St. (not in a straight line!). We returned to the car, and I no longer had my fob.
It's just the fob on a ring, with a key-sized stainless steel guitar-shaped tool also on the ring. Pictured is my back-up fob, with a key instead of the tool, which is about the same size.