https://wccftech.com/intel-core-i5-12400-es-oem-cpus-are-available-for-sale-on-228-us-on-ebay-heres-why-you-should-avoid-them/

Intel's 12th Generation Mainstream Alder Lake CPUs such as the Core i5-12400, Core i5-12500 & Core i5-12600 have started being listed down on US-based E-Commerce sites such as eBay. While it provides anxious buyers the opportunity to purchase these chips weeks or even months ahead of launch, you should definitely avoid them at all costs and for good reasons.

The specifications of Intel's non-K Alder Lake lineup leaked out last week and now these chips are appearing all over the internet in ES variants. According to Zhuanlan, in a detailed post discovered by Momomo_US, it is stated that the ES and QS variants of these chips are appearing in the black market more often now. Following is the designation of each QS and ES chip along with its unique identifier.