If it was made in China, it should say so on the filter or its box.
If it was made in Japan, it should say so on the filter or its box.
If it says neither "China" or "Japan", and has Japanese characters on it (it does), it's probably Chinese imported through "irregular" channels.
Interesting observation about coo that makes sense. I observed the writing on the can, but honestly not being familiar with the writing difference didn't know which coo it might indicate. I thought maybe that the 'jp' in genuine might indicate Japan, but these Honda look a-likes are first about appearing to be something they aren't ie., oem. So, I didn't put much faith into made in Japan either.
I did find the ebay site with more pics and nowhere am I able to see a coo on the can. So, until otherwise noted I'm still thinking China, and the coil retainer does point to that conclusion. But, the can color in very similar to Honda A01,A02 which is the idea after all.