If you don't see a TG or GG on the hub (i.e., it's blank), then anything blank is fake. Real TY will have the TG or GG visible. For example:
Fuji DVD+R 8x MIJ 50 pk have TG001133 on the hub. I bought those from Best Buy
(add) I believe I've seen some reports on mids on Legacy DVD blanks in other threads in this same subforum. Just look for "Legacy" and you should find it.
Sony DVD+R MIJ 50 pk have TG001158 on the hub. I forget the poster that mentioned if the hub doesn't have the TG or GG on it, it's most definitely fake, but I do remember he works in some kind of DVD Duplication enterprise, and burns about 6.000/month and got some fake TYs from a certain place--they have no TG or GG on the hub and the burns were awful. Once he ran the burn tests and check the hubs, they stopped buying anything from the place in question.