I always have two copies of everything. In case one gets damaged/lost for whatever reason.
After I paid, I went to the host stand and asked for a manager. The manager introduced himself and I told him that I wanted to let him know that the server did such an excellent job and I wanted to share something with him. I showed him the flyer and he said, "Oh, you're one of the shoppers. Let me get X right away."
The server thought they were in trouble but soon learned it was all good. They took the photo against a wall. No one else was in the shot.