I see that you view what you did as stealing and it is stealing, but in the game and on this server it is referred to as 'grief', so the rule you are looking for is the rule about grief.
http://www.ecocitycraft.com/wiki/index.php?title=Server_Rules

 

Hi Twinkles,
I'm thrilled to see that you've decided to appeal and once again rejoin the ECC community.

Before the staff can consider your appeal, I'd like you to put some more effort into the reason in which you feel you should be unbanned. Do your best to convince us that you have fully learned your lesson and that you will do absolutely the best of your ability to avoid such actions in the future. You can talk some about your future plans and your endeavors and how you plan on acting in a positive manner. Grief is taken very seriously on ECC, so with that all being said, again I'd like to see some more effort in your reasoning. I don't doubt you'll be able to do so :) Other than all that, I look forward to seeing an updated appeal from you soon.

Locked -- Lack of Effort
Have any questions regarding how I handled this appeal? Feel free to forum message me for discussion.