How can I tell if my Type C Earpods are real?

I bought earpods type c on the marketplace, 2 pieces. Serial numbers are checked, warranty until October 2025. The sound and microphone are good. But, inside the box where the headphone connector was attached, both boxes had smudged marks, one red, the other blue. What is this? Could this be from the factory? Headphones version MYQY3FE/A

[Edited by Moderator]