I keep a "death README" with all of my online and offline account credentials and phone unlock codes, PII that might be needed to authenticate w/ various companies' services, copies of wills, trusts, powers of attorney, health care proxies and so on, copies of all vital docs like marriage certificate, birth certificates, home router SSIDs and passwords, information about doctors, health insurance, life insurance, all financial accounts and brokerages, approximate balances, bills and how to pay them, tax returns and how to file them, a list of recurring expenses and how to pay them, property w/ approximate values, and so on. A hardcopy is kept in our house where next of kin can find it if needed without knowing a safe combination, but casual robbers wouldn't stumble across.