If you met him , it have drop rate as any normal ship.
IBB ships , and soon all unique ones will have chance to drop like normal ship+ forced one with every dmod in existence.
IBB ships are from Ship and Weapon Pack thought :/
What Hrothgar is trying to say is:
Currently, Vayra's Sector unique bounties have an
increased drop chance but are not 100% recoverable.
In the future, Vayra's Sector unique bounties will work more like SWP IBBs, with forced recovery - unless set otherwise by the modmaker creating the bounty.
Any further discussion should go to the VS thread though
since it's kind of beyond the scope of just the Caliph