You can check this fairly easily with https://haveibeenpwned.com/Passwords https://haveibeenpwned.com/Passwords. It's not exhaustive obviously but it's somethin

You can check this fairly easily with https://haveibeenpwned.com/Passwords https://haveibeenpwned.com/Passwords. It's not exhaustive obviously but it's something. 1Password vaults are also encrypted with a separate secret key that is generated locally and never stored. So you'd need the password and the secret key to decrypt.