You look at the date of birth on your driver's license. If it says that you were born after "dead peasant" insurance became illegal, or that you were born less than 15 years before "dead peasant" insurance became illegal, then your employer does not have a dead peasant insurance policy on you. If it says that you were born more than 20 years before dead peasant insurance became illegal, then it is theoretically possible, but still very unlikely.
There are probably more questions about dead peasant insurance posted on Yahoo Answers every year than there are dead peasant insurance policies left in the entire country.
No companies are taking out dead peasant insurance on regular employees. It has been illegal for many years.
A few companies are taking out insurance policies on senior executives to protect themselves from financial losses caused by the death of an executive. And those senior executives definitely know about it, because they are so high up in the company that they would know everything the company does, even if it did not involve them personally. And most companies are not even doing that.