[aussie500]

All the supposed debris seen in the satellite images would have been checked, either by plane or by ship, CSB Brilliant checked out the northern most black one on her way down to the southern search area, that would have been the first French sighting, it was a dead whale.
https://twitter.com/FallonTracey/status/...4262248448
The sightings further north would have been checked out by someone, they just never considered it worth telling us that they never saw anything.

What someone should do is get all the tracking data for the ships that were searching the southern area, the three Chinese war ships without tracking data were all on the east side of the lower search area, chasing the sightings made from the planes. The ships involved in the search of that southern area were.

At least 6 merchant vessels including Höegh St Petersburg and Greenery Sea
HMAS Success
Xue Long
CSB Brilliant
Kunlunshan
Haikou  
Qiandaohu