The California Department of Child Support Services is notifying some individuals of an incident that occurred last month. From their notification letter:
On April 7, 2014, several letters from the Solano County Department of Child Support Services were misplaced while in the custody of a contracted courier who was transporting mail to the US Post Office. Although many of the letters were subsequently recovered, there is no way to determine if all of the letters misplaced reached their destination.
As a result of this incident, Solano County has implemented multiple procedural changes and safeguards intended to minimize the possibility this could happen again.
At this time, we have no evidence that your information was actually lost and/or disclosed to an unauthorized individual.
The loss was discovered on April 9.
You can read the rest of their notification letter here (pdf). Although the letter doesn’t state what kinds of information were in the missing letters, the fact that they talk about reporting “potential identity theft” and suggest reviewing credit reports suggests that sufficient identity information was in the letters to pose a possible risk.