Debian 9 unattended upgrades Nginx and PHP 7 repo apt

I install Nginx mainline version from Nginx's officel Repo. PHP 7.2 FPM from packages.sury.org. In order to let the unattended upgrades do the work for me.

1. I add /etc/apt/apt.conf.d/50unattended-upgrades

Unattended-Upgrade::Origins-Pattern {
  ...
        "origin=nginx,label=nginx";
        "site=packages.sury.org";
};

2. Testing it out

# unattended-upgrade --debug --dry-run
Initial blacklisted packages: 
Initial whitelisted packages: 
Starting unattended upgrades script
Allowed origins are: ['origin=Debian,codename=stretch,label=Debian-Security', 'origin=nginx,label=nginx', 'site=packages.sury.org']
pkgs that look like they should be upgraded: 
Fetched 0 B in 0s (0 B/s)                                                                                                                                             
fetch.run() result: 0
blacklist: []
whitelist: []
No packages found that can be upgraded unattended and no pending auto-removals