Worth noting that most of these seem to have been left out of the audiobook version. There's a note about Secret History having major spoilers for the original trilogy and minor spoilers for bands of mourning, and I think there was a note for Hope of Elantris and 11th Metal, but elsewhere it seems to be absent. I specifically checked for Edgedancer and there's nothing there.
Shadows for Silence, Sixth of Dusk, White Sand, and Emperor's Soul don't having anything in the print or eBook editions either because they can be read anytime and don't need any warnings. So sounds like you actually do have most of them, but Edgedancer's is a glaring omission.
An audiobook seems like a weird edition for a book like this too. There's a decent amount of graphic content that's part of the draw (end papers with constellations and star charts) plus an excerpt of a graphic novel. In a way I'm surprised they did as much as they did.