How can I get the audio files from the audible app from my iPhone to my Macbook?

I have the audible app and a membership. One of the services audible offers to memebers is the ability to return books at any time and you get refunded the credit used to purchase the retuned book. I used this service to return a book that I had already listened to so I could get a new one. The book I returned is still on my iPhone. So my question is, is there a way to get the book that I returned onto my MacBook? I'm afraid that syncing with iTunes will just delete it. Is there a third party software or some way to access the actual audio files in the audible app and move them manually? I'm aware this is shady but oh well.

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