Xbox One/Series game packaging is so confusing now. There's now 3 box designs, each platform is labeled in little text, and fucking CoD is $70 now. Also many cross gen games only give you one version in the box with no upgrade.
To make matters worse, Xbox series X only and optimized games have the same "Xbox" spine design and case as late print runs of 360 games.
I'm sure Microsoft would do that if they still were printing 360 games, but the only games they did that to were the three dual mode Burger King games which had where the "only on Xbox" marking was that it was backwards compatible.
Halo 2 Platinum Hits also was the only bc Xbox game to my knowledge to say it was 360 compatible explicitly.