"While concerning, this case does remind us that there are many layers of protection built into the electoral system to ensure it is secure."
"The system ensured there was accountability, although it seems likely there was some kind of failure to identify immediately that the container had not been delivered to the counting centre."
My confidence in the AEC remains strong. It is a little concerning that the container wasn't noticed immediately, but it doesn't appear to be anything malicious. Just an oversight on both sides for a scenario that will undoubtedly be corrected.
I think they'd have made a point of saying that the temporary staffer was facing further consequences or wouldn't be a part of future elections if there was more to this. The fact they haven't and that the case was sealed/intact leads me to believe it was an innocent mistake.