Where static Pods manifests are located?

Most of the time it's in /etc/kubernetes/manifests but you can verify with grep -i static /var/lib/kubelet/config.yaml to locate the value of statisPodsPath.

It might be that your config is in different path. To verify run ps -ef | grep kubelet and see what is the value of --config argument of the process /usr/bin/kubelet

The key itself for defining the path of static Pods is staticPodPath. So if your config is in /var/lib/kubelet/config.yaml you can run grep staticPodPath /var/lib/kubelet/config.yaml.