If no-one criminal opened the wooden door then no-one would have needed to say the keys to Block 5 went missing shortly before May 3rd. Someone must have known that a key was used to make such an allegation.
So you think that the allegation was made because the person saying it knew that a key was used to enter the apartment? If keys were lost it's a bit of a leap to say the person reporting it had knowledge of a crime being committed in 2007 but only mentioned it 7 years later to a UK newspaper.
Perhaps you can tell us who made the allegation? As far as I can discover the Sunday Express were 'investigating' in Portugal and 'tracked down' a former maintenance worker (now retired). Why? They don't say. Who? They don't say.
Still, what does that matter, he had exciting news apparently, which could change the direction of the international investigation. An employee had lost the keys to Block 5! He named the employee and the Sunday Express 'tracked' him down also! Investigative journalism at last? Not really, I don't think he was hiding or anything like that, just getting on with life as he had done for the previous 7 years. He denied losing any keys.
Following these exciting revelations OG, (do they get leads from the newspapers?) through the PJ, interviewed him, the Head of Maintenance and the Mark Warner managers. Nothing more has been reported.
http://www.express.co.uk/news/world/458798/Apartment-key-theft-cover-up-by-resort-staff-in-Madeleine-McCann-case