At the end, the Leverage team are standing at the top of the jet-way watching as Lampard is confronted by the Fish and Wildlife officers. They would not have been allowed past security if they had not bought plane tickets/had boarding passes.
When Rampone encounters Eliot in the walk-in cooler, Eliot responds that he was looking for ice. In a restaurant, any extra ice would be in a separate walk-in freezer, which wouldn't contain boxes of produce, except when the walk-in freezer is built such that the only entry is within the walk-in cooler, keeping the risk of a door left ajar resulting in spoiled frozen stock to a minimum.