Thanks for reaching out to us.
Based on Article ID: 000083214, the top marking format does not include the marking number as shown by you. You can refer here: What is the top side marking format for Altera devices? (intel.com)
I am really sorry to inform you that we can't confirm the part marking verification in order to avoid the devices from the grey market.
However, I can suggest one way in which Intel PSG has its authorized distributor to sell Intel devices. If you got the devices from formal distributors, you shouldn’t worry about the device authenticity as the devices must be valid units. Otherwise, we do not ensure the device's quality and do not provide further service. You may find the authorized distributor list from the link below:
Hope this helps.
From what I got from my internal team, the marking shown by you does not meet the standard part marking for the device. Anyway, there are some cases where custom marking have been made for specific customer. In this case if you does not know, then this part was not originally meant for you.
Can you provide to me where you purchased these parts?
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