ALFA AWUS1900 very if its original or fake?

Hi i just bought an alfa wifi adapter from local seller in facebook market place, and would like to check if its original one or just another counterfit

so far it works on windows haven't tested it on kali yet, device manager recognize the chipset as RTL8814AU, but still not too sure if it genuine module or not
is there a way to check if its genuine without opening it and verifying the chipset and PCB part??

Edit: i found this article of disessambly and mine is similar, but i also saw that the original have blue PCB mine is green and im unsure if mine is original or not please help
https://fccid.io/2AB878814/Internal-Photos/Int-Photos-3443784

submitted by /u/EvanMedi
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from hacking: security in practice https://www.reddit.com/r/hacking/comments/19896hb/alfa_awus1900_very_if_its_original_or_fake/