I have the limited edition red 25th Anniversary Wii with Super Mario All-Stars pre-installed as a channel. I reformatted the Wii to get rid of all the Mii's and save files, but it deleted the pre-installed All Stars game as well.
I'd imagine that if ya can't get that Anniversary Super Mario All-Stars pre-installed junk back via Wii Shop, you'd have to contact Nintendo directly. Go here, select your country, grab Nintendo's contact info (at the bottom of the page) and get in touch with 'em to see if there's a way for them to get you back your stuff.