If your husband has declined the benefits of health insurance coverage with his employer he is under no obligation to complete and return a mandatory census even if requested by his employer. The rationale is that since he is not receiving health care coverage through the employer, he is not responsible to complete any requirements to get it or a census requested by the employer.If the employer continues to pressure him for it, he should consult with a labor attorney or consult with someone with the local department of labor about the situation.