User blog comment:IamJakuhoRaikoben/Sorcerer Magazine, Issue 30: June 2014/@comment-80.226.24.3-20140710181047/@comment-4449950-20140711014115

Well, it is a fanscanlation, but it is a translation of what he said, which was "Kabaa o nakushita... dato!?"

You can see the original here if you'd like to double check ;D The images are from the bonus pages of Volume 43 :)

The exact version I used for the cover can be seen here.