What surprises me about that is that they were allowed to buy Duty Free in LAX when they weren't departing on an international flight. Bearing in mind that they were free to walk out of the terminal in PHX (and LAX for that matter) with their goods, I think the fault there lies with the Duty Free store who shouldn't have permitted it and certainly shouldn't have handed it to them direct.
Had they bought Duty Free goods at PHX their purchases would have been sealed and taken by the store directly to the plane to be collected on boarding to prevent the system being abused.
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