If the thief managed to change his address, he probably also changed his phone number. And if the thief had sufficient access to change the address, he could have easily transferred any money from savings to checking.
Don’t think there’s much one can do besides guarding their privacy to not become an easy target, using good security like 2FA and email/phone notifications, and keeping an eye on all accounts.
The spreadsheet I use to keep track of my money has a field for next statement date, and the column next to that shows an indicator (an arrow in my case) if the date has passed. It’s a reminder to download the statement and update the date (manually). I don’t really ever review the statements because I keep track of current account balance and can instantly verify it at any time.