How to know if my MacBook is original?

Please check here.

• If you have your product's original packaging, you can check the barcode to find the serial number. You can also find your product's serial number on the original product receipt or invoice. Or choose a product below for details about finding the serial number.

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Check Your Service and Support Coverage - Apple Support

Where did you buy your device? That could be a huge clue.

~Katana-San~

[Edited by Moderator]