@onetrack.
This link you posted talks about the Cocos site as being to far away
http://www.ctbto.org/fileadmin/user_...ines_MH370.pdf
But, the report was prepared well before the Southern Indian Ocean was the search site.
That being said, if it didnt pick up an explosion or splash impact from about 1000 k's, that means something/ (distance roughly from Cocos to Ocean Shield site),