Engineering samples have an inscribed IHS, such as the Ryzen sample below, so they can identify and track them, so I doubt highly there are any functional dies under it. Also, if you look at a proper Threadripper processors, there are some components inside the center slots, as in the middle picture, where yours, pictured at the bottom from what I suspect is the same eBay listing, has one, so it could in no way be functional.