My 9 year old cousin has the Japanese Wii and has Wii sports but I only boxing is available to play. the other games are there but greyed out. I have no idea why you cannot select these.
Lol the copy you have is what they use in Shops For you to test.
Because when I tried out WiiSports in a shop it wouldn't let them use Boxing for some reason. Maybe yours in like that execpt you can't use Golf Baseball Tennis or Bowling lol...
I dunno try getting a japanese copy or Contacting Nintendo