From the author's perspective, this is not expected according to their agreement with Amazon. Unfortunately from the consumer's perspective, this is not surprising at all. Everyone I know has received a "used" item sold as "new, sold by Amazon.com." Whether it's due to commingling, or an attempt to reduce waste, or plain corporate greed, I have no idea. Just saying that if I returned a book on Amazon, I wouldn't be surprised if it was soon sold to someone else, even if I was the author of the book.