>>375240435
Do you not understand how servers work? At least suggest something plausible, like secret admin backdoor or something. 
EVEN in that case, you'd be able to get IP connection logs and tell that they could. It would be impossible to do it silently. Sure you can change the IP but if you boot up a server for just you and your VRfu to ERP in, and then a third IP connects you know what happened.