I'm in the same boat.
I found the helmet and totally fell in love with it. However, I can't seem find the rest of the orange set. For those of you who don't know it looks just like the Level 40 PvP Set.. Reskinned blue.
By now I can almost rule out the Flashpoints ( the sets dropped there often are somewhat familiar to the ones gained through quests ). My best guess would be one of the AREA Quests or the Bonus Series,allthough it seems to be higher in level than the gear.
You have to take the data from TORhead or others with a grain of salt. They may have managed to datamine the gear, but that doesn't mean that it's actually IN the game. Could also just sit somewhere in the code.
Anyway, if anyone manages to come across any more parts of this baby..... I want to know., too!