I got a 5960x from an eBay seller that had a re-etched heat spreader. With a YAG laser or similar it’s possible, CO2 would require messing about with ceramic spray and probably isn’t worth it. Either way re-marked CPU’s and outright fakes are common, just like the GPU’s from China with fake bios details added. The good news is where the seller has deliberately sought to misrepresent the product you will likely get your money back with minimal agro (other than in my case the seller offering to burn my house down). Got to love eBay 
