So, I is-cooped this guy called bigman_04 and his punishment history isn't too nice. Greifing SB W. Severity 3. I'll leave a comment if this guy really did grief me. This is basically a alibi.
My only advice for you is to remove the coop and find someone else to do whatever you are having him do there. It really is not worth getting your stuff taken or griefed. If he does end up griefing you make sure to get sufficient evidence and send it into the "Report a Player" section of the forums.