What is the content of the retail version?

Hello,

Can you tell me exactly what the content of the retail version?
The box contains a Steam key for it to install the game from this platform ? Or is it necessary to install the game from the DVD ?
The soundtracks are on the DVD or is it a Steam key ?
Is it the same for the artbook ?

I ask this because I prefer to have all on the Steam platform and do not go through the DVD to install or play.

Thank you in advance for your answers.

Since this game is steam exclusive for mp you can assume that it contains a steam key…

I think the rest is just fancy stuff such ss the artbook etc… I don’t know it for sure though as I bought only the digital version…