From Apple service center feedback,
1) From the video I attached, if is original, the light that coming in from outside this case will be very very small (indicate that original one the case is more solid or better material) and also no hidden wording from the case.
2) The weight of the bud, he let me feel the weight of the original AirPods Pro and mine AirPods Pro, he mention original is heavier, but honestly is a bit hard for me to check it.
Hopefully provide the guide above can help other ppl buying second hand unit with Caution.
Point 1 is one very good checking point, where you can see the differences the light shine in the case.
Actually I kind of happy with my unit, just unable to update the firmware than only I realized this not original. This AirPods Pro is actually my colleague before resign give to me, as myself I won’t go buy it. Therefore no one to be blame on this matter. However is a good to let other ppl know about this
Finally, the serial number is NOT a good measure that your unit is original, so keep this in mind. (Don’t be like me, go to Apple website key in serial number than feel secured that Apple recognise as AirPods Pro.
Thanks for everyone that replied me in this forum. I guess this could be my last post of the year.
wow, you went through all the troubles just to check the authenticity of a gifted airpods pro? kudos.