Game Case Difference?

Is there a reason why some Xbox One game cases say “Xbox One” at the top, while other only say “Xbox”? My son noticed the difference and I haven’t seen any explanation. I have noticed his copy of Bioshock The Collection only says Xbox on the header, where as all of his other Xbox games say Xbox One. Also, one the one that just says “Xbox”, I noticed that the Xbox logo is stark white and is not reflective like those that say “Xbox One”. Can someone solve this mystery for my kid?