The drop rates are bullshit.
I have 70+ clears...
I saw the hair like 5? ish times
I saw the minion 2 times
I saw the shroud 1 time
I saw the tile mount 2 times
You're definitely fighting layers of RNG. RNG of the farm group. RNG of the happy hour. RNG of the coffer drops. RNG of the roll. I hate layered RNGs personally...
But of course this could all be 'unlucky RNG'...