$ dpkg -S /etc/nginx/sites-enabled/myservice.conf
myservice-config: /etc/nginx/sites-enabled/myservice.conf
$ apt-get remove myservice-config
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'myservice-config' is not installed, so not removed
0 upgraded, 0 newly installed, 0 to remove and 8 not upgraded.