rare items

there are many new acs and rare items that are realeased today like the new weapon that you can get from undead pirates and so i killed undead pirates over 67 times and didin t get the drop and i have even botet for them over than 5 straight hours but didint get the drop so what should i do?

Keep trying. I don't know the "Pie-rate Birthday Cutlass +5 2014 " drop rate, but it's just bad luck.