Project 1999 - Stibnite Crystal in GD location help

Has anyone completed the Phenocryst Focus quest? I need help finding the stibnite crystal spawn in the Great Divide.

Quest info tells me this:

Quote:

The stibnite crystal is found in The Great Divide. If you enter the wurm caves in the center of that zone from the south, go up to the first right, go in and take the next right, you'll be in a room with two spawn points for wurms and there's a patch of blue crystal at the back of the room. The stibnite is behind the crystals and looks like a bag on the floor. It spawns every 1-2 hours or so I think. The description of the item is "Bent Metallic Crystal". It weights 20.0, is magic, lore, and no drop.

Which would put us at the blue X location on this map (loc -5048, -713):

http://i.imgur.com/p5lfzq5.gif

Looks like this in game:

http://i.imgur.com/611m0RY.jpg

I have checked this spot daily and have spent hours here today and no bag has spawned. So would just like some input from those that have done this quest. Is this the correct spot? Do I need to be killing the wurms so they don't pickup the bag?

Any help would be appreciated. Thanks!