No, wait. If this is story content then it shouldn't be a CM item. I haven't seen it yet, but if it's story, then that's not right to tie it to CM.
each cube gives u a quest on Nar Shadda with a 1 minute cutscene of the shroud talking about his plans. there are 4 cubes in total.
also looking at it form the view of people buying cartel packs, they are getting multiple useless items. these cubes are purple items. so people paying for packs are basically being cheated out of one purple item everytime they get a encrypted cube.