My iphone13 pro is that original
My iphone13 pro
is that original packiging
iPhone 13 Pro
Question marked as
See if it appears under warranty information:
https://checkcoverage.apple.com/
or:
Settings > General > About ( if using iOS 12.2+)
The only way to be certain a device is not "fake" is to only buy one from Apple or an Apple Authorized dealer.