Even at that, I recently bought two books, both arrived damaged. Returned them (I really don't want to have to do that, and I thought "fulfilled by" would reduce that likelihood), and the replacements were damaged. I gave up.
The first pair arrived in a plan white box, and were damaged (not due to the courier).
I returned them to Amazon for replacement, and the pair I got back were in a fully branded box, with a lot more accessories than the first pair (storage bag, shape retainers).
So I'm left thinking that even though these were "Fulfilled by Amazon" there must have been some counterfeit mixed in with legit inventory. Otherwise I can't explain how the first pair seemed so... illegitimate in light of what I received as a replacement.
Shipped and Sold by Amazon is your last line of defense and I'm still convinced it's a trustworthy way to buy. What Amazon better do is assure that it remains that way AND give us an option to filter out EVERYTHING else.
Regardless, it was a bad experience.