From John Underhill PI.
Every missing persons case the family should have a PO BOX not connected to the police. the box should be advertised with the flyers. Yes! you will get strange mail, you can have a family members or friend review the mail. These people involved will not send it if its connected to the police. If you hire a PI have him check the mail out. You will be surprised what mail you get, even a tip, location, name. Info only!