Multiple logins

[PracticalBot]

On one site, we have many tools to find multiple logins, but do we have any tool for members who don't remember their old account or that there is an old account?
Maybe nobody wants to tell the spammers that we know them already, but I really like to tell my users something like:

Hey, do you know the username uncl***m? If you have problems to use it, use the contact form!
Don't register a second user account, if you have one, please!

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