How to fill out eviction forms. The form you need to respond to an eviction case is Answer - Unlawful Detainer-Eviction (form UD-105).To complete an eviction we require the original writ, Sheriff's fee, and a signed Contra Costa County Sheriff letter of instruction for eviction located above. A: Use the attached form. Modify to your Number, Court and fill the blanks and file with the court and serve upon sheriff's office.