It isn't enough simply to sign a bunch of papers establishing an estate plan and other end-of-life instructions. You also have to make your heirs aware of them and leave the documents where they can find them.

Consider: At least 10 states have been investigating whether some of the country's largest insurers are failing to pay out unclaimed life policies to beneficiaries. California and Florida have held public hearings on the issue in recent weeks.

Insurers...