I did that once, except it was left over steak and some sides from a really good 4* restaurant. I had it all wrapped up, paid the bill and took it outside to the valet area (which is inside another building). We drive away and 5 mins realized what happened, so I turned around and went back thinking it would still on the bench where I left it. The valet guy who was helping me went on break and my delicious steak was gone (presumably in Mr Valet’s belly). That was fine by me… hopefully he enjoyed it as much as I did!