Presumably, the life insurance is a benefit of work--either something which the employer is providing for "free" for working there, or something which you are purchasing through the employer. In either event, if the employer will not provide evidence of the coverage, when it is either a benefit of the job or something you are paying for through the job, you could sue the employer to force them to provide this evidence (and if they have not provided the coverage as promised and/or paid for, possibly for compensation, too).