I open 50-100 packs every month and i play since october 2016. I never got hashirama or tobirama and i never saw somebody getting them from lucky board packs. I saw people getting them from mission general mobilization packs, yes, but never ever from lucky board ones. I am of they idea they are not there at all and if they are really there the chance for them to be pulled off is at least 50 times lower than in mission generap mobilization packs where, anyways, is lower than 1/500.