Ask at the airport information desk or lost property. They most likely know some way of ensuring the contents gets given to a charity or at least recycled properly.

Subterfuge will at the very least create overhead for the airport personnel, who will have to either destroy the contents safely or hold on to it for a long time before disposing of it. And you really don't want to have to explain yourself to airport security if this spiel is noticed.

Ask at the airport information desk, lost property, or a luggage shop (thanks @Fattie). They most likely know some way of ensuring the contents gets given to a charity or at least recycled properly.

Subterfuge will at the very least create overhead for the airport personnel, who will have to either destroy the contents safely or hold on to it for a long time before disposing of it. And you really don't want to have to explain yourself to airport security if this spiel is noticed.