Official Forms for Viewing and Downloading. Download PDF BOE-502-A REV.Total of 103 forms are available for Contra Costa County for 2024. At this clinic, attorneys can give you information about court procedures, provide court forms, and assist in filling them out. Fillable forms are available for download in multiple languages from the California DCSS to apply for services and other child support-related topics. Your Registration Code is a unique code created for each vendor number and tenant number. You'll need your tenant number or vendor number.