There is a number of items (for the time being I am only checking weapons) that have no info about their location in the construction set.

For example there is Anora's Club, Enarmor, Herders Crook , Iron Fork etc that if you right click and check the info the have nothing at all.

Does it mean they are not anywhere in the game?

Some of them are added via script, and others are given to you in dialog. Others were scrapped mid-development and thus do not appear in-game.

Bethesda didn't remove them entirely, not anticipating that "clever" people like you would make gawking at the CS item listings their new pastime.

Oh well. Just getting my moneys worth from the game. Once you pretty much finish the quests etc collecting things is kind of a favorite passtime.

Well if your worried about it, all you have to do is add them all in in a simple mod, oh right.