The collectors were describing a genuine charity which helps orphanages, and had done preparation by printing out photos and learning its history and offering receipts. But someone who helps run that charity said they don't do door-to-door collections. So there is a possibility the collectors might have been bogus keeping the donations for themselves.
However IMO the burglar(s) who opened this child's bedroom window and shutter, unintentionally triggering an accident IMO, were just petty burglar(s) nothing to do with any bogus charity collectors.
You are of the opinion that they are two entities. It is possible, but until they are traced and eliminated we can't know for sure if they were part of the same team.
At this remove I doubt that will happen.
Whatever; I am absolutely unconvinced that Madeleine met with a fatal accident within the apartment - it is a theory which can only be sustained if an explanation can be found to explain the lack of a body let alone evidence that an accident occurred.
Why would her parents remove her body if as you think no entry was made by an intruder? [/list]