I have written about a dozen books. Just under half were e-books, and one I released as both an e-book and as a printed book. Before I had sold any of the printed copies, there were 4 printed copies shown as “used” for sale. Each of these was a counterfeit title. I ended up discontinuing sales of the printed books entirely.
Unfortunately, all web services that are open to anyone – whether it be social media, product reviews or open sales platforms like Amazon – are subject to fraud and abuse.