Generally, if you did not receive any cash dividends over the life of the policy, they were all re-invested for additional insurance, then your cost basis is still what you paid out-of-pocket for premiums.
Essentially, when dividends were paid your cost basis was reduced, but when re-invested it added to your cost basis so they cancelled each other out.
If you did receive cash dividends at any point your cost basis was reduced. When you paid the remaining premium out of pocket, your cost basis increased.
As you mention your insurance company will have all that information.
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