I can't find any direct connection with Hongkong and Mitsui.
This could mean 2 things.
A manufacturer in Hongkong just uses this atip because the strategy fits the dye better / people think the quality is better.
B Mitsui/CSI have licensced somethng there or they made a deal for some production at another factory.(Just like in the old days when prodisc made disc's in Taiwan for Mitsui)