I boarded a pirate ship but cant take their stuff

First, its a really great game and i was already thinking why nobody was exactly doint this kind of game with the rimworld formula. so thank you!

i am now in the first system with pirates and so i decided to board one of their ships. i killed the crew and thought that i could scavenge now, take over their ship or steal their cargo, but somehow i cant do anything... (except stealing a few of their guns) a bit later a second pirate ship jumped into the system, so i also boarded the second one.

am i missing something? or is it not possible?

if not it would be great if it would be possible!