Since the box is just what they're all shipped in and you get one per order and not one per copy of the game, I don't think it should be considered part of the set. Of course, the box is certainly collectible, so it does have a place in our database, I just think it should be part of a separate listing.
I do think that the soundtrack should be part of the same listing as the game though, since everyone got one with every copy they ordered and it wasn't an optional add-on item. We have plenty of soundracks in our database listed separately from the games that were sold with already anyways so I don't think my opinion on that really matters in the end.
Ah, I like the idea of the box as being a separate collectible item. Maybe like swag or something.
I'm fine with the soundtrack being bundled together with the game as I totally agree with your logic (the soundtrack itself says that it's not for re-sale and was to come with the game only). Do you think the item title should reflect it? Previously it was just "Summon Night 5" which feels so lacking to me, but sometimes that's how those things go.
I'd agree with swag, since it's a vague enough category that pretty much anything works there if there's no other suitable category.
As for the title of the game's listing, that's a little harder to say. The fact that it was bundled with the soundtrack should certainly be mentioned in the description field, but whether or not it should be reflected in the title is less obvious (to me, at least). I would say go with whatever Gaijinworks called it, but I think they only ever referred to it as
Summon Night 5 and not some kind of bundle or whatever. However, because it is the only physical North American release of the game, simply using
Summon Night 5 for the database entry shouldn't cause any confusion.