I did a little research into this a few years ago when someone asked the same question (pre the forum). Here is (roughly) what I wrote. Not sure if there's more info than this but the Yahoo group may be able to help.
I'm not exactly sure but I guess there are a number of printers who do this - you could try emi/toshiba in Japan or Universal?? They both have japanese websites (I think).
Disc Union create the "promo boxes" and they are exceptionally good quality and are official releases. Try them but their English is not crash hot.
Also you could contact www.cdjapan.co.jp as they have a good English writer on their "help" staff and are quite helpful if they can be.
If that fails you may want to ask in the Yahoo group (link found at the top of the forum pages).
You could also ask www.soundsourceCDs.com (in the US).... And also... I have a box of Black Sabbath (2001) ... made in UK "An Essential Production for Castle Music, a label of Santuary Records Group Ltd." Not as good quality but pretty good none the less. I also have a Uriah Heep box made by or for them (2002)
www.gilmourdesign.co.uk seems to do the work on the Uriah Heep box for www.santuaryrecordsgroup.co.uk
Also try a cheaper alternative (??) http://www.burningshed.com/ - artist's own label stuff.....