As admin/owner, am I able to see or figure out who looted a large furnace? Was just asked tonight by a player and told them I am pretty sure that can't be done? Can it?

Merged post

BTW, server is PVE and I was pretty sure no-one was/is able to loot or use anything belonging to another player. But this player spawned in and was in some random team with 2 other people that they didn't know?

Without having a plugin to log looting history, not that I know of.

Would you know anything about a glitch/exploit that makes you join anothers team when you are logged out of the server?

I don't, sorry.

I did a google search but came up with nothing except from a year or so ago with some guy saying it happened to him.

Same. I know bug when you leave team and i thought its kind of bug when play in Server 1 with team A B and join Server 2 with team C D or A C then in Server 1 you do not have team or someone said when die or Team Lider die again  can loose team. But next was very strange and no logical answer here:
One of my players reported that when wake up in my server were in team with other random people from my server again but he didn`t known them so didn`t added them in his team and his real team with teammated was disbanded (and like replaced) he has this new team. Imagine if this  teammates were online too. They can see his base for example. Strange bug but cant find if how happened.

That's pretty much what happened on my server. Player woke up in a team with 2 people she didn't know and stuff missing out of her quarry. 

1. No, not without any plugins/scripts
2. general rust bug. Let me "try" to explain why that happens. Person A creates a group which will get a group ID A, player B creates a group and gets an ID B. If your server restarts all of the group id gets mixxed. Why? dont know ask Facepunch. It just happened on our one Server which daily restarts, while our other servers never had that complain tho.