Remotely identifying counterfeit devices is ~impossible.
Some counterfeits are awful, while others are quite good.
You’re asking here, which means these are real, or are at least not an awful copy.
Serial numbers, model numbers, look and feel, all of that can be copied. And is routinely copied.
If the model code is to be believed, it is for Singapore, not Malaysia.
What the details of the Apple sales channels are in that area, I do not know.
If all three audio modes work and the AirPods Pro case can Qi charge, then the AirPods Pro are probably either real, or a good enough copy not to matter.
Related, Adam Savage of Tested reviewing counterfeits: https://www.youtube.com/watch?v=Db99cXMD780