Secret way to launch Agent in Mac?

This VOX player has it's continuously running VOX Agent. It is running under the user, and is protected, so it reboots immediately after killed.

Problem is that VOX Agent doesn't appear to have any plist in usual Launch Agents or Launch Demons locations. Not in the user, not in the system directories.

"Launchctl list" shows this process (com.coppertino.VOXAgent).

"Launchctl remove" kills the agent and it does not reboot, but after restart it comes back again.

Question: are there any secret launch locations in Mac OS, except:

~/Library/LaunchAgents

/Library/LaunchAgents/

/Library/LaunchDaemons

/Library/StartupItems

/System/Library/LaunchAgents/

/System/Library/LaunchDaemons

Thanks.