When you say posted well within your handling time....

Was this over the counter with a lodgement scan event?

If this is the case then you will be protected against any late shipment defect as after that it does not matter when it actually arrives.

The fact that you lodged inside your handling time is good.

If they do issue the defects they ought to be easily removed with the tracking evidence.

Not too sure how you would go up against a claim of INR when the tracking does not show delivered tho.

You would have to get AP to find out where it went.