"on the days right after" is Sol's text, not a direct quote of what the lady said, therefore IMO it's possible the muffled cry was heard on night of 3rd but not reported until 5th.
Or it's just another one of those misunderstandings. The PJ went to the address, but not because of any cries, muffled or otherwise;
Diligence carried out on couple in Edificio Pedras Brancas, Luz, Lagos 2007.05.09
EXTERNAL INQUIRY REPORT
Date: 2007/05/09
Place: Edificio Pedras Brancas, no. *** - Luz - Lagos
Responsible Officers: Reis Santos, Inspector Chief, Helder Carmo and Tony Almeida
Description and result:
---At 08H30, it came to the attention of the PJ, from an individual who chose not to identify himself, that the day before yesterday (08/05/07), a couple resident at number *** Edificio Pedras Brancas ' Luz ' Lagos, had conversed, and in the middle of the conversation it appeared to him that they were discussing a child and the possibility of the Police finding her in that place;
---We immediately left for that residence indicated above;
---Upon approaching the residence in question, we were greeted by the owner identified as K*** P***** K*****, born 12/04/1968, in Scarborough ' U.K., holder of a British passport no. ******, and to whom we explained the reason for our visit. He immediately invited the PJ inspectors to enter and to carry out all necessary checks;
---In conversation with K*** K******, he confirmed having had a discussion with his wife and referred to the situation of the missing child and that she had to be found by the police in the Luz area;
---K*** ***** also informed the officers that on 02/05/2007, he was hospitalised due to a right foot fracture;
---He also identified his wife, S****** D***** R*****, - Germany, holder of a German passport, no. **********;
---We looked through the home, and nothing was found.
http://www.mccannpjfiles.co.uk/PJ/EXTERNAL.htm