Here in Canada, if a bank account has "No activity " for at least ten years, the Bank of Canada moves the balance to it's Ottawa account. Every year, on April the first the Bank of Canada releases a national list of all "Unclaimed Bank Accounts " on the internet. This lists the account information, such as the name of the account holder, their last known address, the name of the bank, the address of the branch, and the amount balance.
This is public information. In the past, when I was employed as a Private Investigator, my boss used to have me work some of the biggest balances, when our office was not busy. I sorted by the amount in the account, by odd family names, and by small Canadian towns.
One of my favorite files was Martin Goldfish, who died alone in a small town in northern Saskatchewan. He had 4 bank accounts IN Toronto, and the total balance was more than $750,000 CDN. I was able to find that Martin Goldfish was NOT his real name. He was actually Gerhard Bronski born in Poland in 1924. He served in WW 2 as a German army conscript. He came to Canada in 1951, with forged ID documents as Martin Goldfish. After 1955, he simply went underground with no records of employment. I had a certified death certificate from Saskatchewan, that didn't list any heirs. I worked that file for about 4 years, on and off, with no solutions.
The oldest "Unclaimed Canadian Bank Account " listed by the Bank of Canada dates from 1905. LINK.
https://www.unclaimedproperties.bankofcanada.ca/ JIM.