When I first saw that Maus booklet, it took a moment before it registered that what I was looking at was a detached Raw insert inside a CGC case. A strange sight indeed... I think the reason I was at first thrown-off was because--like you--I would think of the booklet as incomplete without the issue it came in... Due to its larger than life format, CGC doesn't grade Raw; but if it did, would a copy of Raw #2 grade as complete if it had the Maus booklet missing?
Let's not get started on how CGC would grade the seventh issue of Raw with the deliberately torn cover.
To answer your first question: How could it? The Maus booklet is part of the guts of the issue of Raw, if' it's not there it's the same to me as say a Mad Annual missing it's insert, or let's go with UG and compare it to say a Deep 3D without the attached glasses. Now look at the reverse...would you want the glasses without the book or the inserts without the magazines? If both elements are not together you don't have 2 different books, you have 2 different mutilated copies.
As far as the second question goes, if you have the correct piece of Raw #7 that fits into the torn section, then you have a mutilated copy, too. AS and Ms. Mouly state in many places that the torn segment should NOT match the torn cover. Therefore, if the piece is incorrect and mounted in the right place, CGC should grade it accordingly like any other comic/magazine.....also since they grade posters now, why don't they use a variant of those containers to slab issues of Raw in? So much confusion and so much beauty....I weep.