It's not the third-party, that's for sure. Sellers on Amazon are almost entirely at the mercy of the honesty and good graces of the buyer. And, thanks to the rise of "drop shipping your way to riches!" "gurus" that have proliferated the web over the last few years, the Amazon marketplace has become a sewer of white-labeled identical (trash quality, usually) products all sourced from manufacturers on sites like Alibaba.