The item description claims that it contains the encyclopedia. But as Dark Savant said, it is probably best to mail them.

I got my first edition superbox for 30€. But that was just a short while after its release, and from the UK. I suspect that Megastore is unaware of the growing collectors value of this item, it is after all a big chain, and those are usually horrible at finding the right price point for games that are not brand new.