Purchase not Validated.

I recently bought a used iPhone from an online store. Upon the arrival of the item, I immediately check the device’s Serial Number on Apple’s Website to verify if the iPhone that I have purchased was legit and the device was really legitimate and it shows me the actual color and the right model. But it shows me “Product Purchase not Validated”. I don’t have the Official Sales Receipt since it was a used iPhone.

Should I proceed and contact Apple Support to validate the purchase date or should I just let it? It was an iPhone 8 Plus and it was expected to have expired Coverage.