I dont know whether this design is on purpose, or not and i can't quite put my words to explain it, so i will provide an example.

Lets take a mythic item: "Torc of Tonal Constancy"

it requires 5 separate antiquities to put together. Parts of sorts right ?
i found one piece in Stonefalls, and excavated it.
I noticed that it immediately unlocked the entries for "Torc of Tonal Constancy" in, Craglorn, Bangkorai, Alik'r Desert and Deshaan somewhat indicating that the rest 4 parts are in those zonies.

My problem is, that i have now 4 parts out of 5 unlocked and i have no idea in which zones out of those 5 i have already found them and which zone is the one that i havent found the last part yet,

Is there no way to tell which of those 5 zones is the one i still did not find the piece yet ?

Conclusion
Game shouldn't tell you in which zones the remaining parts are located when you find one piece, but it does so, indirectly by unlocking the entry for whole antiquity in those zones:
Game should tell you in which zones you found the pieces that you already have excavated to avoid looking in the same zone, but it doesnt. It is strangely iminous as if on purpose

Do i really need to keep track on paper where i found what ? what is this, 1990 ?

i want to point that i do not intend to look in the web for locations of antiquities. And please dont post spoilers or locations here in the replies