Myself nor the two others that were there got any uggalepih key from the Hover Tanks ,so if they do drop them they are very rare.From other people posting it seems they get the key by 15 kills and we killed around 50 Hover Tanks with no key so i would say they are not a good mob to target for the key,if you are farming coffer key and get lucky,then great you lucked out :D
Yes Hover tank does drop the key i was recently farming smn tests and i killed a tank and it dropped a rdm test and a key so they do drop keys just a rare drop.
I killed a ton of Hover Tanks while hunting for RDM testimonies in the Temple. I never saw an Uggalepih key, although I did see a lot of Uggalepih Coffer Keys (very different).
Tonberry hate is a moderate annoyance, but there's an easy way to fix it:
You just need invis to get to the room. No mobs aggro to sound on the way to the Paintbrush room.
Drop invis, trade the key to the door, and you're in. There are no mobs in the paintbrush room.
The book that the rusty key drops out of is random, which is why one poster got it from the left book, another got it from the right. Just examine them all until you get a rusty key. Trade the key to the casket, the Paintbrush of Souls will be obtained, and warp/escape out (unless of course you need to use the Paintbrush right away. ^^)
Astaro wrote instructions here for obtaining the paintbrush from the library. The only correction to that is that the Worn Book that you must examine is on the far left, not the far right.
There really is nothing, however, to worry about, since you can examine all the worn books in this room (located at F-7 on the map) with no ill effect. This room is labeled the "painbrush room" at http://www.ffxi-atlas.com/ .
Reading the book entitled "Understanding Art" will cause a key to fall out, which is required for opening the casket in the middle of the room. Once you open the casket, you will obtain the key item, paintbrush of souls.
I stumbled across one of these helping with DRG AF3 and was very pleased because I could use it to check several additional coffer pops to get my map. I ran around for a few minutes before server maintanence and then logged after finding nothing.
To my dismay when I logged in today I found it was gone from my inventory this morning. It looks like this, along with the Prelate Key are one time use only, so be careful what you use it on.