Obviously witnesses are often told to keep secret their communications with police.
And that is exactly what this witness correctly did.
Proof see Mail Jan 2008 witness quote
"We ... have had no contact with the investigating police since May 26 last year".
In fact the witness was correctly keeping secret the various important communications with Gardai, with Leics Police, and a phonecall with the PJ, in Sept 2007.
The Policia Judiciaria under Amaral paid scant attention to the sighting by the Smith family between May and September of 2007.
Appropriately, when Mr Smith made an addendum to his original statement, in the September, they were interested particularly as he declared that the manner in which their prime suspect carried his child reminded him etc etc etc.
Subsequently the PJ under Rebelo showed as much interest as the PJ under Amaral had in the previous five months in anything Mr Smith and his family had to say.
That suggests something to me if not to you.