Lets get an update.
Okay, the facts so far...
Mount Zoom = Done - Rats turned into RatWraiths (South West)
Bag Endless-fuel = Done - Rats leave under 'Saruman serconstances'. (West)
Orth-Tank = Not Done
Barad-Dash = Done - Rats eaten by Orcs.

(west)
Medul-zoom = Done - Rats scared by weird Worm thing. (North)
Minas Mor-go = Done - Rats chase Orc corpse (South West)
Minas Taxi = Done - Rats lured by marmite. (West)