Should i buy an iPhone 6S with itune and usb logo on it?

Hi, I'm going to buy an iPhone 6S on ebay, I recently did bought broken iPhones and repaired them and sold them and gained profit, but this one i'm quite unsure. The owner of the iPhone claims that the phone is in perfect condition and somehow he got in itune logo and he dosn't know how to fix it so he bought another one. I know how to fix it, you basically restore it but I'm not sure that does it have any other problems?
So can anyone please tell me any other problems with itune logo, apart from restoring the phone, on iPhone 6S?

Well it might. If the phone is stolen it might have a bad imei and might be icloud locked, so you might not be able to use the phone as your own if it's stolen…