Halo 5 Rated M???

At RTX 2016, 343 did a panel discussing Forge, Halo Wars 2, and other goodies. But what caught my, at 3:48, eyes was this:
Halo 5 Case says Rated M, 17+ What do you all think?

It’s just a screen grab from the internet, most likely before launch. People thought Halo 5 was going to be rated M (naturally) so someone, somewhere decided to photoshop the mature rating on the box.