Living Story unlock question.
I think you need to finish the episode before you get the box to drop. Then you get one free and can buy a second one.
Rognik is correct. Regardless of whether you have the LS chapters unlocked or not, those items won’t show up on the vendor until you actually complete the story line and get the item at least once. So in this case, you would need to do the story once first before the popped on the vendors.
Thats weird because I can buy Carapace Headgear Boxes which should be unlocked by the Mystery Cave from Seeds of Truth.
Yet I have never played any episode of LS at all but I have Seeds of Truth and Tangled Paths unlocked.
Headgear was the last unlocked, I believe, during Point of No Return. It’s also remotely possible you got one of the chests from a drop in the jungle. Have you checked your collections to see if you have any of the collections unlocked?
edit: got the wrong chapter name