Where does the file get stored with to_file() about audible HOT 5 CLOSED

from audible import Authenticator

class ExtendedAuthenticator(Authenticator):
    @classmethod
    def from_dict(cls, data: dict):
        auth = cls()
        auth.locale = data.pop("locale_code", None)
        if "login_cookies" in data:
            auth.website_cookies = data.pop("login_cookies")
        auth._update_attrs(**data)
        return auth

    def to_dict(self):
        data = {
            "website_cookies": self.website_cookies,
            "adp_token": self.adp_token,
            "access_token": self.access_token,
            "refresh_token": self.refresh_token,
            "device_private_key": self.device_private_key,
            "store_authentication_cookie": self.store_authentication_cookie,
            "device_info": self.device_info,
            "customer_info": self.customer_info,
            "expires": self.expires,
            "locale_code": self.locale.country_code,
            "activation_bytes": self.activation_bytes
        }
        return data