Several major life insurance companies have established online lost policy finders. If you have reason to believe a policy may have existed with one of these insurers, you can use these websites to search directly by company at no cost:

Canada Life/Great-West Life:
https://www.canadalife.com/about-us/consumer-information/unclaimed-property.html

Metlife:
https://www.metlife.com/policyfinder/

New York Life:
https://www.newyorklife.com/claims/unclaimed-funds-finder

John Hancock:
https://www.johnhancock.com/forms/account-search-request.html

Sun Life of Canada:
https://www.sloc.co.uk/slfuk/Customer+services/Find+out+if+we%27re+looking+after+a+policy+for+you?vgnLocale=en_CA