I already had accounts at E*TRADE. How do I know which account(s) is from Capital One Investing?

If you created an account nickname at Capital One Investing, you’ll see the same nickname at E*TRADE. If not, we have created one for you to help you match your former Capital One Investing account(s) with your new E*TRADE account(s). Just look for the last four digits of your Capital One Investing account in parenthesis in the nickname displayed next to the E*TRADE account online. You can change your account nickname at any time.