A genuine Apple device has a designated serial number, which you can search on the Apple database. To authenticate your device and verify the serial number's validity, head over to the Apple website. Use your Apple ID, check your settings or look at the packaging to obtain your serial number.
Make sure the colour, capacity, and warranty information of your device also appear on the box. In case of a mismatch or information discrepancy, visit an Apple store near you for immediate support and resolution.