For the past two months I've been monitoring activity in one of the systems I have towers in trying to find out who may have taken, without my permissions, material inputs/outputs and POS fuel from my towers.
I haven't had any luck in finding out but since nothing else had happened until overnight Sunday/Monday of this week. Sometime between going to bed and waking up again (about 9 hours) I found lost all the output (about 36 hours worth) from my towers.
I had mentioned it to a couple of people when it first happened and was recommended to remove access rights to my towers, I did but I reset them when someone else (not alliance) asked for access so they could boost in peace).
I've now reported it to my corporation leadership and found out that I wasn't the only one that had suffered a loss. It seems a few people had and even more intriguing was the fact that the people who had POS access was a very small group of no more than six to eight people.
I'm not really bothered by the loss, ISK can be replaced and it wasn't a huge amount anyway, but more so I'm bothered by the fact someone whom I count as a friend has done this. If they needed ISK they could have asked, I have very favourable rates for friends and I'll only break legs once...
The corp leadership is going to put out a mail about this, not much else that can be done, the list of people who have access is small but there is no evidence or indication of who might have done this.