Finding unclaimed life insurance can be a painstaking task. I have to assume you are looking for a policy within your family. First, you will need to be prepared with information about the insured. Second, go to MIB.com. In the upper right hand corner you will find a link saying, "find a lost policy".
There is a fee for this service and it certainly is not guaranteed you will find the policy however this is where I would start. Good luck.
You can search for missing life insurance benefits at the unclaimed property office of your state. A website that contains unclaimed property in 38 states is missingmoney.com. If a death certificate is needed in order to collect the life insurance money, you can go to vitalcheck.com to see if you can access one.
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There is a fee for this service and it certainly is not guaranteed you will find the policy however this is where I would start. Good luck.