I recently bought some used paperback books through Amazon; of course, fulfillment is through any of a large number of their re-seller partners (or whatever they call them).
Some of the books came from the state of Washington. I now wish that I had not bought any of these books from any of those Washington outlets.
It seems there are a large number of these re-sellers, or at least they have a lot of different names, that share offices and warehouse space. Among these are Sierra Pacific Books, Thrift Books, DailyDeal USA, Green Earth Books, Yankee Clipper Books, and several others. The problem with these sellers is that as part of their inventory process they put large barcode stickers over the spines of the books. Sometimes, if the book is relatively new and the spine is not cracked and the cover is still glossy, these can be removed without damage. But on several of the books the stickers took off some of the color from the cover.
To be fair, when I complained they offered me a partial refund on the damaged books, but some of these books only cost a few cents (plus $3.99 shipping, which is where they make their money) and in any case I wasn’t worried about the value of the books but the hassle of the process. They are not interested in changing their process.
So I have resolved, and I recommend to you, if you are shopping for used paperback books on Amazon, avoid any book that says “shipped from WA” because it will almost certainly have one of these stickers on it.