There is no Wii logo on the spine.
lol
Actually the cover I had from that game didn't have a logo either...after searching for some info on it, it was apparently a printing mistake and a lot of the copies had a spine missing the Wii logo :\ I never noticed until it was pointed out.
As for Muramasa: Demon Blade, I believe I have the retail cover on my other computer, I'll try to put it up sometime tomorrow if you're still interested.