MCC is made in Singapore, Taiwan (CMC plant), India (Moser Baer plant), and UAE (Falcon plant).
Notice that I said "plant", not by CMC/MBI/FTI. MCC has their own personnel, processes, etc. So it's not outsource media. It's just co-located at another facility. That happens often in other industries. Example: web hosting.
I don't know if MCC still has the Singapore plant. That is/was the main facility where new media always came from.
Mitsubishi has never made DVD media in Japan. Maybe for CD-R, but it's been probably 20 years.
You bought the best media. Now use it.