I dont think this is the assassin bug which has a long neck and head. http://www.hartmanprehistoricgarden.com/sa-repipta.html
Yours looks like the cotton stainer bug, or similar, http://www.dpi.qld.gov.au/26_14461.htm
and the colors will darken when the shell hardens.
You probably don't see the adult colors yet.
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