They don't exists....
0.005% drop chance. not cool
pantalaika on eu-mannoroth got them and don't use them
my guild dk Karamoonbane got the tusks of mannoroth on wednesday this week, go check her armory, ally US turalyon, i'd link it but it won't allow me
was my first ever kill above LFR and they dropped, my heart skipped a beat, sadly i'm a druid so no point me rolling for them