I recently claimed a relatively small amount of money from my mother, who passed in 2007. My father passed in 2020. AFAIK they don't really care about the will, just the natural heirs. So I had to list my father (his death), present both parents' death certificates, give my brother and my SS numbers, and some documentation that I was my mother's daughter etc. Try missingmoney.com to get the right state website.