Would you inform your bank if your account had an additional $25,000?

Would they find out anyways?
Update: Why would THEIR mistake make YOU a fraud? Aren't you entitled to spend whatever is in your account, without investigating who deposited what into it?
Update 2: Maybe God knows the person is struggling and wanted to help them, and it was a bank error in the computers, the money does not belong to another person, it just appeared there in like a typo type of way.
Update 3: By the way this is hypothetical.
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