All right here are some pics.
As you can see, the sleeve is a little over-sized (this case was designed for a Kindle 2, which is slightly wider and longer). But I actually did not use it much for the Kindle because it is a little too snug for me. It works better imho with the smaller Kobo---as long as you don't mind having that wasted space at the bottom since the Kindle is longer
The Kobo is better than the Kindle for reading 'naked'---more ergonomic, and with that comfortable backing. So for me, having a proper case for it is not that big a deal, I just want some protection for it if I am throwing it into my bag. And I am not sure I'll keep the Kobo---if my mother doesn't like it, she'll give it back to me, but if she does, I plan to give mine to her once I have the 'playing with my new toy' impulse out of my system
So I am not going to invest in an official case for it if I already have one that a) does the job and b) which is not already in use.
Anyway, you can see how it looks in the pic, so you can make your own choices