I would bet most sales will be download myself.Where I live its difficult to even find a computer game in the shops.Its all console stuff.
Some people will pay big money for a 'collectors' edition,but most people don't really care about the box.
A map? Probably be able to download one shortly after release.
Pilots notes? Can buy that Spitfire booklet for £10
A big box? My wife will just moan about that.