How to check if my iPhone 12 Pro is original?

Greetings Helloapplesupport,

Thanks for posting in the Apple Support Communities!

We understand you're curious about your iPhone coverage and support, correct?

If we understood you correctly, you can check if there are any concerns with your serial number using the steps below. In addition, you can locate more ways to check with this resource: Find information about your warranty or AppleCare plan - Apple Support

See what your coverage includes

1. Go to mysupport.apple.com.

2. Sign in with your Apple ID.

3. Choose your device. You can see details about the support that you're eligible for—including hardware repairs and technical support.

You can also see coverage details in Settings on your iPhone, iPad, or iPod touch. Here's how:

1. Open the Settings app.

2. Tap General.

3. Tap About.

4. Tap the name of your AppleCare plan. If you don't see an AppleCare plan, tap Limited Warranty or Coverage Expired for more information.

If you need additional assistance, contact Apple Support directly.

Have a great day!

You posted a full screen shot, which includes the serial number on a public forum. Never post personal details on a public forum. I have asked the forum hosts to remove the screenshot for your protection.

Open the same settings page and this tap the model number and report back what it says. Just post the number.

What is the model number?

The model number indicates that it has been refurbished by an Apple authorized facility.

You are welcome.