You do not have to be mained Ranger to get the cutscenes from the artifact beret quest.
I got the quest as RNG 55, then went to the Mithra in the smithing guild in Mhaura as BLM 17, got the cutscene, warped, and went into Eldieme solo as 61 THF / 30 NIN. After going through the passage beyond Titan's Gate and coming upon a giant, open-aired room, the correct room with the sinner's daughter's grave was the one to the right. The Azer conned EP and did not aggro me.
The artifact gloves can rot in the Garlaige Treasure Coffer.
I just began that quest and went on to Crawlers' Nest. http://www.speakeasy.org/~sticks/ffxi/treasure/title.html
For all your coffer/chest maps with locations needs.
Upon entering the nest, I suggest /search-ing for a party either killing rumble crawlers or helm beetles (Lvl46-54) and asking if the coffer is there, if it has been opened and when it was opened.
If they don't have the slightest clue, drop down into the worker crawler room with the maze lizards and take the 2nd right turn you come across if you dropped to your right and continued forward, that is.
There may be trained Soldier Crawlers and (buddha forbid) Rumblers on your way to the next floor of CN, so I suggest sneaking up at this point. Wind through the claustrophobic tunnel. Soon, you'll reach the next floor of CN, and be on the southeast corner of the map. Continue far north, until you reach the drop-off of the room at positions H-8 and I-8. Without a map of CN, you can still check your position and use a printed copy of the eternalforce maps to know where you're at. Use the compass the game provides. Once in that room, take the NW tunnel and stick on your left. You'll reach yet another drop-off point. Resneak here. Drop down and check the wall under the drop-off ledge. Check the other 'cave-rooms' in the drop-off room. They are little juts that are fake 'tunnels' and inside of the dead-end is where the coffer spawns. Not there? ****, wasn't there (the first time I checked) for me either. Invis up. Take the NW tunnel and continue north past the right turn. You'll be in a Big room with Dragonfly's. They aggro to sight. Upon entering, hug the wall to your right and keenly make a trip around the wall of the room. Not there? Wasn't there for me either. Try to ask the parties killing rumblers / helms to /tell you if they spot the coffer, as at this point you do not want to walk all the way to the helms. Most likely, you either overlooked a spawn (since they are nearly all in a small cave-in of a camouflaging CN wall and they are protruded by a well-placed ledge, or the coffer was recently picked. I met 2 soloers on the floor of CN with 5 spawn locations.
After getting aggrod by a Dragonfly and instant warping, I checked the rumble/helm tunnel myself, found nothing, met a train in the tunnel leading to the next floor of CN, died, came back, Sneak-ed up for safety, and, after yet another thorough check-up of the 5 spots, found nothing. But I wanted the **** Braccae, so I constantly checked the 5 spots, and it spawned in the cave-in of center-left G-8.
<Please forgive me.> This became monstrous.