The people who see the massive signs all the way through the arrival hall with pictures of stuff like sandwiches. Seriously, you can’t miss them
Never been in an aussie airport so I’ll take your word for it. Still though having to declare a sandwich is beyond absurd. I get the reasoning for raw foodstuffs but a cooked chicken sandwich isn’t carrying anything that granny couldn’t also just be carrying in her body.
You might find it absurd, but it is quite common. The same rules about cooked food now apply, for example when travelling from the UK to France - that sandwich could have been seized when travelling into Europe - there were some travellers who were caught out travelling to France following Brexit. https://food.ec.europa.eu/animals/animal-products-movements/personal-imports_en
Perhaps anyone listening to the plane announcements, looks at any one of the multitude of signs on arrival, or anyone (everyone) who fills out the incoming passenger card? It’s not at all unclear what you have to do when you’re there. They make it clear to declare everything at multiple points. There is no penalty for declaring something even if it’s not allowed in.
On the first side of the incoming passenger card, half of it is taken up by the question:
Are you bringing into Australia:
[…]
Meat, poultry, fish, seafood, eggs, dairy, fruit, vegetables?
Grains, seeds, bulbs, straw, nuts, plants, parts of plants, traditional medicines or herbs, wooden articles?
Animals, parts of animals, animal products including equipment, pet food, eggs, biologicals, specimens, birds, fish, insects, shells, bee products?
Don’t forget to declare any stuff that might get trapped on your shoes. Iirc people have been jailed for having “marijuana traces” on them.
EDIT: not sure why people are voting down but this actually happened: https://www.npr.org/templates/story/story.php?storyId=18842015