Necro thread, I know. Just wanted to add to this in case someone comes across it. Matsui is the production company that made these cameras. They even have some with their own name on them. Also went under Olympia, Nikkon and Regal (just some others I've come across).
From what I've read elsewhere on the web (mostly people's accounts on how they acquired them), these cheap P&S-handed-off-as-SLR cameras were given out as promo "gifts" for cruises and time-share sales. You know "come check our sales pitch and get a free gift for showing up!" type things. Also from what what I've read, Canon never gave them permission to use their name on these products and I believe (although I cant find the reference now) that Canon sued them but couldnt win because the country in which these cameras are made in doesnt give a damn about copyright laws.
Just for reference I'll add some of the model names I've seen so far:
TC-8000 (with or without a "D" at the end)
Q5200
Q8200
S8200
Camera "A"
Camera "B"
CNx30
Kit 3006
Color variations exist. Can be seen in all black, black with gold top/bottom plates or black with silver top/bottom plates. There were two different flash units sold as well. One with a rectangular head and one with a more circular head. Camera bags given away with these can also vary. Some were just very basic zipper bags with minimal padding and some came in what appears to be legit Canon branded bags with a buckle closure top flap and canvas material. Since I haven't held one in my hands, I cant verify that nicer bags were legit Canon bags or just another knockoff.
As I come across more information, I'll post it up here. I'm actually intrigued with these things however I wont spend a dime on one.
*EDIT* Just found a few more "brand" names used: Olempia, Nokina, Nikai, Canomatic, Mitsubishi, Mitsuba, Mitake, Nikkei and Polo Sharpshots. A slight variation of the body was sold under the names Pantium and Goldtek.