Detective Randy Stevens said the child apparently unlocked a door at his nearby home, got out, then crossed a multilane street to reach the store.
A canvass of the neighborhood turned up a family member searching for the child.
CPS spokeswoman Shari Pulliam says the agency has taken oversight of the child during a review of the incident. She says the boy will be allowed to stay with other relatives, not the parents, during the CPS review period.
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