That is a very mild form of griefing when you attempt to hijack an unsecured area of land. It violates not only our zero griefing policy but also builds zone violation and player harassment. If you twig raid into someone's base you're raiding despite your actual intentions and we treat it as thus.
Also, your usage of "I haven't looted yet" really dictates your actual intentions on the server. If you're not willing to follow simple server rules we do not want you here.