I don't have Audible (or iTunes) and I don't have any audio files in my collection that use any format other than MP3, but my stuff does work in the audiobook folder. I have even put a few albums that are "rock opera" in that folder, and some comedy albums, because MP3s of that style don't play well in shuffle with a bunch of three minute pop songs.
I don't know what causes the difference is between my experience and yours. But the original poster might as well try it, at least - they have nothing to lose.
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