what intel saysThat said pre release samples were covered in HP:Ritter and Microsoft:Comtek collectibles. First sale doctrine applies even if the ‘payment’ was a security deposit. When they keep deposits on unreturned loan samples contract law dictates it’s a foreclosure on a loan. So despite what the link states there’s not much intel can do against such collecting sales.
Look up as much as you can from ID numbers, if any; or count the pins and note the (c) date stamp to come up with a generation to narrow down what it is if blank. Look up values on ebay, heritage, sacks etc. If the value is enough to sell it have at it. If anyone gives you any issues on ownership or whatever, though, call your lawyer. Nobody cares about a $20 sale. But if you ask $1000, auction it for 500, etc, you may want to get as much advise as you can up front.
And ask more informed people. Eg the CPU wiki on fandom. Places like that. There regular collectors can help you navigate both the law and the wild marketplace.