The easiest way to recover or mount an off-line ecryptfs directory is the built-in command from ecryptfs
sudo ecryptfs-recover-private It will find your wrapped passphrase and ask for your password and mount it in tmp. Much easier especially when your current active OS is using ecryptfs too.
This a fantastic tool when going through old backups.........
There are 3 pieces that are required to restore and make it work (of course consider if any kernel modules need to re-enabled and if you need to change the IPs):
Copy the vz/private/VEID directory to /vz/private
Copy the /etc/vz/conf/VEID.conf to /etc/vz/conf/
mkdir /vz/root/VEID
After that you should be able to see the VE in vzlist -a
You should then be able to start it normally.........