We volunteered in Rocky Mtn. Nat'l Park. There are signs all over about not leaving your cooler outside. You're given a separate flyer when you drive in. There's a poster on top of the picnic table. You would think this would give a clue to most folks.
A party left their cooler on the picnic table early morning. The ranger confiscated it. At 11pm the party returned and knocked on our door DEMANDING his cooler. He was told what happened. He then DEMANDED that we go to the ranger's station, get it and return it to him. Ha! Sure Thing!
The next morning they packed up and left. They were kicked out of the campground without their cooler.