Before making a purchase, decided to check out the feedback of a Seller offering the item that I wanted. Was surprised to find that although the Seller seemed to have a perfect score, they had several feedbacks crossed out along with Message from Amazon: This item was fulfilled by Amazon, and we take responsibility for this fulfillment experience.
(Attached is a recent capture of one Seller's feedback with two such crossouts.)
After Googling, it appears that this feature has been around for a while, and that it can be abused: https://sellercentral.amazon.com/...-fba/44546
Posted in Deal Talk, as some Deals may not be as good as anticipated given this element.