Police are investigating how the boy ended up with the relative, but investigators are pursuing the possibility that the kidnappers realized the seriousness of what they had done and dropped the boy off.

They're pursuing the possibility? Is that similar to trying to believe in? Because the next thing they say is:

A man who identified himself as the family member with the boy at the airport and who was questioned and released by police said that he picked up David at his Mattapan home and that he brought him to pick up his mother when she arrived from Puerto Rico.

All that in only three hours. Those repentent kidnappers must have just dropped the boy right off at home again. And that family member must have been just unaware that Carlos Perez had informed the police the boy had been kidnapped. So that's why he didn't call the police and say the boy had been found.

It sounds to me like that 2003 Honda Accord must have had a shaggy dog in the back seat.

Something messed up must have happened, because why else would a fellow with warrants out on him go to the police?

I'm not even going to ask why a mother would leave her little boy with a fugitive from justice who owes gangsters money while she was out of the continental US. I'd say that's not the best choice of babysitter.