Both myself and another player have had an issue in getting Tokuno Artifacts. Assuming that Rune Beetles drop 1.5k each, I have killed a total of 380. Additionally, I have cleared Fandancer Dojo 25+ times, along with killing Bruce Lee a total of 12 times. With all these chances to receive an artifact, I have received a total of Zero, none, nada, zilch. While running between 2000-3000 Luck.
Bearjew (Stairs) has had the same problem, and after talking to him, I we have one thing in common. At one time, both of us have had negative luck (wearing one or more pieces of the Pirate Quest gear).
I had someone help me, and witness the issue, Light Swarm was kind enough to hang with me for a bit, and we matched both damage AND luck, in the matter of less than an hour, he received a total of 8 Artifacts. In the matter of countless hours, I have received none.
I understand RNG is RNG, but something seems off.