Here are my few other thoughts
1. I do not believe the parents did not notice anything different in him, now if they don't pay any attention to him that is an other story & might have been a cause to this action by the boy.
2. How did he get Rs.15,000 ? did he stole it ? or ask for it ?
3. When he was leaving with a bag full of cloths, why was he not stopped ?
4. There is something either you or his family are not telling here ... I do believe the family is hiding something ... I dont know what ... but this scenario is not the whole truth.. call it professional judgment
5. Why dont you have any other pictures of him?