Distributions from owner of int. (non-ADR)?

I've just learned that my father had carried a life insurance policy and in 2002, Principal life Ins. sent out a check for Distributions from owner of int. (non-adr).I was told that since I'm the listed benificary (and only survivor) that it is mine. What is this pay-out? He started the policy in the late... show more I've just learned that my father had carried a life insurance policy and in 2002, Principal life Ins. sent out a check for Distributions from owner of int. (non-adr).I was told that since I'm the listed benificary (and only survivor) that it is mine. What is this pay-out? He started the policy in the late 60's and passed away in 1993. Also, wouldnt the ins. comp. be obligated for the full death benifits since the policy was in effect when he died. I know squat about life insurance and New York State Unclaimed funds wont tell me anything till they verify who I am. (understandably) The suspense is just driving my wife,kids,and my self nuts. Thank You
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