MTP - ok got it. But are you suggesting that a visible track that was black which had a visible black label attached to it (with callsign, mode C, CFL, GS, whatever, etc.) flew through several ATC sectors in BN centre and presumably several different controllers then without being seen by them on their screens. It was right there on the screen in black (creamy coloured background I assume still) but simply wasn't noticed??
If that is what happened there is something seriously wrong with the controllers concerned and I guess that reflects on the corporate ASA and associated training etc. I've been around a while at a few different places and seen some incredible "things" but I still find that one hard to believe in an Australian ATC environment - there must be more to it than that or things really have gone down hill like the rumour mill keeps reminding me.