[Roadman]

In terms of it failing, you can return the items normally like nothings happened. You can even use the same previous return label.

As for what's happened, it seems to me Amazon Australia has finally catched up with other countries in terms of security as investigations for 30 days has always been a thing in UK and USA.

You have been lucky to get 1 week ftids in the past. I have never heard of that before.

So in answer to your question the only way your ftid will fail is if they say youve had too many refunds, rather than the method itself.

Keep us informed!