When your password is found ever, the consequences can be severe. Here are just a few potential outcomes:
Assuming you want a feature specification for a security tool called (or perhaps a feature called "Password Found Where?" for a security app), here is a comprehensive feature draft. mypasswordfoundever
Get used to letting your password manager do the heavy lifting. When you sign up for a new service, let it generate the password. When you need to log in, let it fill it in for you. It will become second nature. When your password is found ever, the consequences