Morning, Maki! Have you ever been on the Kiyoken Factory Tour in Yokohama? Each time that I have been in Tokyo I've bought a box of their shumai in a department store just so that I can have the Hyo-chan ceramic shoyu container. I see from your Tokyo Google Map that you've been to a Kiyoken restaurant. I'd certainly go to there for the shumai , especially if I could get more Hyo-chans. ^_^