-Fake mask that comes in box will have a blurer printing than the real one
-Fake mask will look slightly yellowish and the essence are not as thick as real one.
-The smell of fake mask will be pungent, like gum smell.
For the real mask, the box will got a logo of the company (upper), whereas the below one doesnt have.
*The logo is situated below the 30g / 10piece there*

For real mask, the serial number behind the packaging will got alphabet.
*either is like the pic, alphabet at the back, or in middle (2940410B217C)

Hope these information helps u all to differentiate between real and fake mask, so that u can protect your face and make it look nicer not worse =)
Picture credits to: Blurz


