Retrieving original iCloud email and password using iPhone

I gave my friend my old iPhone last year since she didn’t have one and she got my iPhone taken up and recently she gave it back but she had already changed the iCloud email to hers and doesn’t remember her iCloud email or password. I still have the original box the iPhone came with though. Is there still hope for me to unlock this iPhone with the box

[Re-Titled by Moderator]

Original Title: iCloud email and password