Why wasn't tour of secret released in blu-ray

[Mr. Goto]

How come back in 2011 when they re-released a bunch of her concerts in blu-ray they skipped tour of secret?

At the time her older concerts were being re-released I didn't even notice but I was recently thinking about getting m(u) and secret's tours in blu-ray, then I realized the latter doesn't exist Just wondering if they ever gave a reason why or if anyone could tell me possibilities as to why they skipped it