Ask HN: How to disclose something without disclosing it?

A while back I came across an interesting problem that I've been thinking about off and on. Let's say I am thinking about taking a job working for a large company, but in some relatively dangerous part of world. I don't think I would take the job unless, among other things, I knew that the employer had kidnap and ransom insurance for its employees. However, some K&R policies prohibit the employer from telling the employee that the coverage exists. Is it possible for the employer to prove that they have the insurance without telling the prospective employee?