tmar
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I would guess that by the time of Borce's second interview (was that 9 or 11 days after Karen disappeared?) they would have known exactly where his phone and Karen's phone pinged on that day, and the day before. Every spot along the way ... and when. And that is likely why Borce revealed that he forgot he went for a drive that day.
I think he probably clammed up and refused to 'help' any further once they told him that Karen's phone pinged out that way, too.
They probably had a very good idea much earlier than that. But it may have taken a day or two to form a flow chart of the route the phones took, as the relevant telco(s) may have had to interrogate their own towers and ones belonging to other providers as well.
They certainly knew a long, long time before they released that info to the public, in August. And they probably released that info to put more pressure on Borce and gain more public information, through Crime Stoppers and other sources, about potential witnesses to Borce's movements on that day.
SouthAussie.
From readings here, BR only stated he went for a drive re 'faulty gauge', AFTER Police told him, his phone pinged on Calder, the day KR went for her walk.