How to make sure certain mailboxes don't get moved?

We have 3 Admin Mailboxes that were moved again and I just had to move them back to the required server they need to be one.
How can I lock down each mailbox to ensure that someone can move the mailbox through ADUC or Powershell?

Also is there a way to turn on internal Audits now since we are SP3 RU2 to capture who moved it if it happens again?
Who is Participating?
Remove admin rights from other users?
could be move them into the seperate DB and then play with the *RBAC* move-mailbox rights?
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