Look what I just got in the post

I have one of those

So far he has
Disconnected all power to all PC's, monitors and printers.
Sat with the lights off.
Now he has gone to the building next door (ours too) to find out if it is the HD equipment whining when switching hertz (or some sort of other madness I don't really know what goes on in his head) because he thinks it is coming through the fresh air vent.
He even went and had the aircon engineers called out.

Must get it out again.