I've seen threads about this before, but now I've stumbled upon what the seller claims to be an Intel confidential processor for sale on eBay.
There's the link. Sorry for it being mobile.
Not really sure what to do or where to put this, so I'm just sticking with here for the time being.
Hello SeaCrane1, thank you for reporting this sale.
Intel ES Processors are not made available to the general public by Intel because they are intended for pre-production test and evaluation work under specific contractual terms and conditions that assure the protection of Intel's assets and confidential information. Intel ES Processors are not warranted by Intel and are not intended for resale.
We will forward your findings to the appropriate department.
More information available here: Processors — Information About Intel Engineering/Qualification Sample Processors