Not only are many of these books "not-for-sale" advanced reading copies, but stripped books are being sold by used book dealers.

A stripped book is one that has the cover torn off. This is a common practice when bookstores return unsold books and returning the cover is cheaper than the cost of packing up entire books. The book is then (presumably) destroyed or discarded.
Many times the book will contain a notice that if the cover is missing, you have purchased stolen property. Neither the publisher nor the author ever received money for the first sale, therefore the first sale doctrine doesn't apply.

I cannot believe Amazon is willing to be a vehicle for some sellers to profit from the sale of stolen merchandise! Has their legal staff bothered to investigate their liability?