'I Got a Boy' has debuted at #7 in Japan selling 15,868 copies, becoming their 3rd Korean album to make it to the top 10, and 5th overall.
http://www.oricon.co.jp/rank/ja/w/2013-01-21/more/2/
The first 4 albums were
'Hoot' (3rd Korean EP) - #2, 170,000
'Girls' Generation' (first Japanese album) - #1, 872,000
'The Boys' (3rd Korean album) - #2, 107,000
'Girls' Generation II ~Girls & Peace~ (2nd Japanese album) - #3, 180,000 (#31 this week with 3,189)
Their Korean albums haven't been promoted there since 'Hoot'.
'I Got a Boy' has sold 80,000 copies in Korea, so far. (40,000 first week, 27,000 2nd week, 13,000 since Monday).