The bag looks authentic. It looks like box to me too. I have never seen a chamonix in a bag this old. Maybe it is dull from age or someone applying a treatment to it. Did you notice that there are initials on the turn key plate?
Thanks! Interesting yeah I felt like it was more of a box. Did not notice the turn key plate initials is it the tiny stamp on the right of the front strap plate? Next to Hermes Paris?