We won't add  that value to the value of each game because those items are not unique to each game.  We keep track of the value of each box, and manual, and cartridge/disc because those are unique to the games but those sleeves are the same for every game you add them too.  Same with protective plastic covers for boxed games.

Yes, there is some value to them but it isn't something we will add to the value of each game.