Monster Zero x SciFi Japan - Archive Only

I recently picked up this interesting Godzilla boxed set (unfortunately, the box cover has water damage, but the contents are pristine). Not too sure of what it exactly is - I have never seen it before, and can't read it. It appears to include copies of posters, newspaper articles, ads, children's documents, etc. The box is about 15 inches long, so some of these documents are quite large! Of course, many fold out (the photos only show them folded). Anyone familiar with this? Someone on skullbrain translated the box to read Godzilla Collection, but no one else had any information.

I stand corrected. The 30th Anniversary logo (30周年) seen on several of the KK vs. G mini-posters does not refer to a rerelease of the film but rather to the 30th anniversary of Toho Company Ltd.

"The history of TOHO STUDIOS goes back to 1932 with the founding of the Photo Chemical Laboratory (PCL). "
http://www.tohostudio.jp/en/general/history.html

Thanks! Much appreciated.