Hello,
At first here an interesting thread about bone daggers:
http://www.vikingsword.com/vb/showth...at+bone+dagger
Your dagger could be a Dani or Itamul dagger, they come often with this scabbards.
There are no CITES regulations about cassowary articles, only the Australian cassowary is protected so far I know.
Regards,
Detlef