After a discussion with Micky and Lightning Dawn I came to the following: Your warning is valid and here is why. Yes you're allowed to raid bases even if the doors are unowned however they were standing in the warehouse in bank which has no rooms nothing and the main door was completely open. It was clearly visible that there was nothing inside and it was a publicly used area, nothing private. Because of this you should have no reason to raid as there are no ways of hiding printers inside or anything you would raid for. Only thing that was inside is 2 players and it was clear to everyone. The reason why you're still getting unwarned is because from speaking to you I can see this was a clear misunderstanding of a thread's comment from month ago and you didn't do it on purpose to cause harm. To avoid this in the future please read my explanation when you can and can not raid if the doors are unowned.
Can Raid:
There are many hidden areas/rooms where printers etc. can be placed in the house/building and because of this you can not make sure there aren't anything inside without raiding.
Can not Raid:
It is a big open area where it is clear that the isn't anything is inside. No props, no rooms nothing. Just a big empty area/house
-Lock Please-