I just killed Shadowheart in tutorial while i played as Gith ...
I mean Cambion did, but i send her there to act as a bait ... so ...
Anyway, my point is, that when you get the artifact, you have only two options ... either stash it, or throw it away ... i understand that situation is tense in that moment (But not so tense so you dont have time to rob few dead bodies i gues.

) ... but since that artefact is litteraly covered with Githyanki runes, i believe at least Gith should have option to study what is it right there. :-/