Yesterday i got tons of items from messages, and every one of them was time limited, but i dunno what 2 of them do. picture of them:

http://i.imgur.com/CjhhMEQ.jpg?1

http://i.imgur.com/BxgxNE1.jpg?1


someone known what they do?

Those keys are needed for the boss runs on the Plane Gate: better save them, it'll save you from crafting them a nice amount of creds!

Nocto, at what level I can get to the gate of the plane

Plane Gate is unlocked when you finish the Epilogue Area, if I remember.