It is legit. That's all the stuff you got with the box. You could turn the box into a storage thing, but as usual with publishers, they don't include any method to do so, the insert you get was this flimsy paper things that holds a couple of small card packets straight up to the top of the box.
None that is official. The first Core box had a decent insert that let you place cards on their long side in one single row across. The second Core box however was much thinner so you could only place cards on their back, that if you closed the box would just mix things up. There are tons of third party solutions but no official ones. The only decent effort I've seen from a publisher to providing a good storage for their card game is Doomtown Reloaded: There Comes a Reckoning box.
It came with a big insert that had space for three rows of cards standing up, and came with hard plastic inserts for all different factions and neautral card types. Plus of course the new cards included in the box. It's about the same size as the Terminal Directive box for Netrunner but unlike FFG they put some bloody effort into it.
