I don't believe any of these 'sightings'.
This kidnap is the most high profile child abduction I've ever known. Whoever took her managed to get her out of the apartment, out of the village and then vanish.
They are hardly likely to then turn up to in a garage, newsagent or wherever with CCTV cameras parading her about.
However, to answer the question, if I thought I'd seen her, I'd look into her right eye to see whether she had that mark, and if she did, call the police on my mobile.
Job done.