As someone who worked for a used book warehouse. Counterfeits are a huge problem. A large source of books for us was at a specific auction. We started gettin

As someone who worked for a used book warehouse. Counterfeits are a huge problem. A large source of books for us was at a specific auction. We started getting so many counterfeit textbooks from that auction that we pretty much had to stop selling textbooks. For a specific textbook that we would get hundreds of, we would purchase one directly from the publisher and then compare.