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They usually have ES,Engineering sample, or Eng Sample written on them somewhere on the IHS of the chip.
However if your next question might be how to obtain one of these, dont ask here, or anywhere on the forum since it will probably be deleted, as they ES are property of the company who sent them out, and are not to be traded/sold or otherwise handed off.
They are also usually part of an NDA (Non-Disclosure Agreement) so anyone other than the intended party having posession of the ES's would be a violation of said NDA and could incur legal issues.
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