Writing on the back of the iPhone 8

Hey, I’m looking at buying an iPhone 8/plus and I’ve watched a tonne of videos online and in all the videos (unboxings, reviews) there is no small print or symbols on the back of the iPhone 8/plus. I want to buy one second hand but a load of them have this writing on the back and it makes me think that they’re not real. Can anyone that has bought the phone directly from apple (in the U.K.) confirm if there is small print on the back or if this was removed like the ones in America?

Thanks in advance