This bug has been in archaeology journals since day one. I'm surprised it hasn't been fixed yet, particularly given the recent (and very welcome) archaeology update.
While investigating an area, eventually you will get the event window message
But that's actually the penultimate (I think) stage in the sequence that leads to really knowing "exactly where" the deed once lay. You have to do a bunch more investigating before Get Direction shows up in the menu for that report.
Guessing this is an easy fix that could be added to the to-do list for the next patch.