I've wondered that, too. I don't think I have seen any confirmation of where they were before the afternoon of the 18th when they were in Jade City. One article makes vague references to them camping in the general area, but even then the dates aren't discussed.@otto's maps rock.
Ahh, this brings back memories...
I haven't seen seen it for a while and what pops out at me now is, where were K&B on the 16th and 17th?
Searching for answers: Sense of unease lingers in B.C.’s isolated north as police hunt suspects in remote killings