First four days I got 4 anbu itachi, 4 anbu yamato, 6 edo yugito and 6 edo roshi frags. That's 10 good packs out of 36.

From yesterday and today, 13 packs, I got 2 edo roshi frags and nothing else.

Third day in a row and not a single anbu or edo jinchuriki fragment.

Whoever says the drop rate isn't lowered is delusional.

And of course, no mod is going to tell us what's going on.

Maybe you are just lucky? The ninjas are still in the packs, but the drop rate is certainly lowered.

There are 18 types of ninja frags in those boxes, six of them are edo/anbu/fuguki. That means 3 out of the daily 9 boxes should drop one of these frags, which was the case the first 3 days. Now it is not.

0.05%? Don't you mean 5%?

Ok, 5% chance to get a certain ninja, which means 30% chance to get edo/anbu/fuguki frags from each box. This would explain why somebody isn't getting good frags for 2-3 days because of RNG. But when you have multiple people experiencing the same lack of good frags over several days then the issue here is not only RNG.