Magelo has them at 31% -
http://eq.magelo.com/npc/25642
Guessing it's not been changed.
Also, it appears to drop 2 at a time (always) -
http://everquest.allakhazam.com/db/npc.html?id=5420
kirbyramz - Jun 07 2007 at 4:10 PM -
"...they drop 2 silks each time..."