Looking for lost Yosuga no Sora content, including a portion of a storyboard for an unmade episode (which we are creating a fan animation/translation for)

We've already found quite a few, but a few evade us. Here is a list: 

Kozue no Sora. Unfinished episode of the anime, released as a storyboard/doujin. We posses it, but are missing 2 pages. We have an animation team working to make it a real episode. It was originally sold at Winter Comiket 2011 (C81) for ¥2,000. Second hand copies pop up frequently for sale online, which is how we got it. But all printed copies purchased this way are missing 2 pages due to a printing error. 

I'm to understand they showed it to the anime's production committee and it wasn't approved, so they ended up going the doujin route with it at Comiket so it could at least get some form of release. Here's the circles blog they made specifically for C81: http://to-ni-san.blogspot.com/ 

They also posted some of the same images from their blog on Pixiv: https://www.pixiv.net/users/30301 

After the event they setup a way for anyone that purchased it to email them to get a PDF of the full thing including the missing pages. But this method no longer works. They don't respond to emails: http://to-ni-san.blogspot.com/2012/02/81.html 

Chances of finding the PDF or just those two pages alone are probably pretty slim unless someone is able to reach out to the circle and they happen to still have the file. We are currently trying to reach them through twitter. If more people reach out they are more likely to respond. 

The other stuff (just as important): 

Doujin: https://www.suruga-ya.jp/product/detail/ZHORE113415 

Same as last one (more info): http://namudai.web.fc2.com/sakuhin.html 

Doujin: https://booth.pm/ja/items/242361 

Doujin: https://www.suruga-ya.jp/product/detail/ZHOI49405 

Doujin: https://www.suruga-ya.jp/product/detail/ZHOI25399 

Doujin: https://www.suruga-ya.jp/product/detail/ZHOI30021 

Countdown promotional audio dramas released in 2009 for HnS. We only have files 8, 10 and 16. More info here: https://web.archive.org/web/20110827122023/http://www.cuffs-sphere.jp/haruka_natsu_countdown/