Yes, they were frosted inside. Same screw on tub even.
When I tested one with CD Speed it tested extremely well, which makes me think that if it was fake would it test so well?
The only thing that makes me suspect is that the ID in CD Speed said just Yuden and I have always seen Taiyo Yuden with CD Speed tests. The Chinese are very good at duplicating things so appearance would be exact even if it were a copy.
Then again, I am beginning to think that if it tests so well who cares who makes it.