At Stamp Paper (Rs-10). File Supplemental C Affidavit of Certification Form.Supplemental C Affidavit of Certification for the City of Oakland. Download. File Supplemental E Affidavit of Certification Form. Supplemental E Affidavit of Certification Form for Oakland Unified School District. Download. Officers responded to a shooting at the intersection of Nelson Ave SE and Griggs St SE. Upon arrival, they found a suspect down with a gunshot wound.