Building a fake iPhone 15 Pro with an iPhone

Perfect for April Fools:

True story: a good friend of mine bought an iPhone 13 Pro via Facebook Marketplace. They didn't check the phone, everything seemed legit (including the box) and it turns out it was an iPhone X converted to look like an iPhone 13 Pro ↗︎.

The friend returned the phone (the scammer blocked them and we had to find a creative way to meet him) and they got their money back but I was wondered how trick was possible. Now we know.