How should I fill out an employment background check form if I have a criminal history? (The background check is post-offer.) All related (31).Learn how to conduct fast, compliant background checks in NY in this comprehensive guide for employers and HR managers. Applicants claiming these credentials will be required to provide proof as a part of the screening process. Once hired, you must complete, sign, and submit this form within three (3) days of your hire date. It is not illegal for an employer to ask you for your social security number (SSN). HOWEVER you are in no way obligated to provide your SSN. Employment with King Plastic Corporation is subject to satisfactory work history and personal reference reports and background checks from outside agencies. Require preemployment background checks. Checks all referees and academic qualifications.