In the forest, near the point where you start as a fox, is a secret shop, it sells information of all shard locations with pictures, if you havent visited that place it might be a good start.
It means that you probaly have a too low reputation, simply doing a few more guild quest or other stuff that gives reputation should change that.
Yes they do exist, they are two out of the three secret tf's, they are ultra hard to find. If you dont want any spoiler on them, beating the game and unlocking ng+ gives hints on how and where to find them but they also can be found in the first playthrough, its just a lot harder.