That’s generally the rule - if you’re not sure, declare it, then if it’s not allowed, it’s binned. There are even signs all over the place through Aus (& NZ) customs saying exactly this.
If you don’t declare it and it’s found or it looks like you’ve tried to hide it (wrapped in luggage) then that’s when you get in trouble for it.
That was actually really interesting - I though if only to discover where the names came from, but it was more than that