Who gave Wax the earring? When?

[ecohansen]

Spitballing here. So, there isn't an easy way for VenDell to have directly placed the earring from his pocket into the file. He gave the file to Wax early in chapter 4:
 

"Yes," the immortal said. He held out the folder again....Wax sighed, then accepted it.

 

It is only at the end of that scene that he pulls the earring out of his pocket--and the earring is not in a pouch.
 

"Excellent," the kandra fellow said, fishing in his pocket. Wayne got interested, until he came out with a dull old bent earring, simple, old-style. "I brought you one of these."

 

We don't know how long VenDell stayed afterwards, but the train left four hours later, and Steris would have had to have time to write a 27-page provisions list and go over it with Wax before leaving. Vendell would have to give them time to do that, and it seems unlikely that, in the space of a few minutes, he would have the chance to smuggle the earring into a pouch, and smuggle the pouch into the file, all under the nose of the word's best lawman.

The next time we see the file is in chapter 6, when Marasi has it in the dining car. We don't know what happened to the file in the meantime, or how it was transferred from Wax to Marasi. Marasi chats with Wayne, then packs up the file, and an earring in a pouch slips out. How did it get there?

 

Marasi stared at the notes. Wayne had left her feeling confused.... So she packed up the stack of pages inside their large folder.

As she did, something slipped out of the folder. Marasi frowned, holding it up. A small cloth pouch. Opening it revealed a small Pathian earring and a note.

Just in case, Waxillium.

Confusingly, when Marasi gives the file back to Wax, the narration says "She held up the pages VenDell had given *her*" (emphasis mine). Is this a typo, or does it mean something?

So, there are three obvious questions: Is the file Marasi is reading the same one that VenDell gave to Wax? Is the earring in the file the same one that Vendell tried to give to Wax, or a different one? And who put it in the file, and when?

Some possible scenarios:
1. VenDell somehow found a way to sneak the earring into a pouch, write the note, and sneak the pouch into the file which Wax already had, all during the visit. This would require a bit of prestidigitation, and it would make it super-cute that VenDell, like a magician, specifically had us pay attention to his hands by revealing that they were originally Breeze's.
2. VenDell gave one folder to Wax at the start of the visit, and another to Marasi at the end of the visit.
3. VenDell knew that Wax would turn down the first offer of an earring, and had already placed a different earring in the file before giving it to Wax.
4. MeLaan planted an earring (either VenDell's or a different one) after meeting everyone at the train. This would have some symmetry, since it was MeLaan who gave Wax his original earring.
5. Steris wanted to bolster her fiance's faith, and hid an earring for him.
6. Wayne slid the pouch into the folder during the conversation. Wayne definitely had the skills to do this, and we know that Marasi had been going through the folder for some time before Wayne came, but only noticed the pouch after he left. But what would be Wayne's motive?

7. Marasi has a haemalurgic spike, and the entity controlling her spike compelled her to plant the earring, and then forget about planting it.
8. Some completely unknown party did something completely offscreen between the two scenes.

So, does anybody have a sense for which scenarios are most likely, and which can be ruled out?

Edited January 22, 2016 by ecohansen