These Info Sheets are intended to help those who are seeking to file a petition or have had a ruling on a petition to seal a criminal case record. The letter should include the name of the court your case was filed in and the case number at the top right.Put the caption (St. v. To expunge an arrest record where no case was filed, click here. To expunge a Superior Court criminal court case that was filed in Juvenile Court, click here. The letter should be polite, concise, and professional, emphasizing personal growth and the benefits of expungement. Fillable forms for filing in Arizona Courthouses.