Because the originals are bound at the end of the year (or month, or whatever).
It looks like it's in a book because it IS in a book.
So, they had an 8-1/2 x 11 page on the photocopier, complete with the security background and a (let’s say) 5x5 hole cut in it. Then they laid the book over the hole so that the security backgrounds of the paper and the book perfectly aligned. Then they pushed the copy button.
I’d say that’s near impossible to do.
its not in a book. this document is dates april 25 2011