It used to be quite common that platinums would occasionally be offered service items from higher cabins... glass of champagne (or vintage champagne from first class if they were already in business class), an amenity kit from the higher class, headphones, even PJs.
Problem was that these were being offered right at the time when Qantas had a major problem with champagne running out in First.
Not sure if these benefits are still routinely offered. If they are to be offered i don’t think it should be done until right at the end of the flight (headphones excluded). That way problems with supply are minimised.