If you know what company the policy is from, just look them up and call. You will be asked to provide a policy number, identify yourself and what you need to know. If you do not know the company name, you can do a search on MIB, Inc. For a fee, they have the ability to search for Life Insurance policies that have been lost.
Here is the website: http://www.mib.com/lost_life_insurance.html
Insurance Adviser - Broker, SC Insurance Services, Oahu, Hawaii
The insurance policies will have the name of the issuing insurance company on it somewhere. If you have a trusted insurance agent that you work with or know you could ask them to look into it for you. Otherwise look up the insurance company, then contact them and ask for an in-force illustration. They are obligated to provide this to you upon request at no charge. When you receive it you can examine it for the details of where the policy stands currently as to cash value and what the premiums are and if it has an expiration date, etc.
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Here is the website: http://www.mib.com/lost_life_insurance.html
Good Luck.