Item #58871 (possibly named "Monster Staff Ethereal Gold Holy Particles") doesn't exist. It may have been removed from the game.
Did You Mean...
Monster - Staff, Ethereal (Gold, Holy Particles) - Live
Monster - Staff, Ethereal (Gold, Holy Particles) - PTR
Monster - Staff, Ethereal (Gold, Holy Particles) - PTR 2
Monster - Staff, Ethereal (Gold, Holy Particles) - Beta
Monster - Staff, Ethereal (Gold, Holy Particles) - Cataclysm