basically like this

Uber uniques are roughly 2% drop rate, but you have 7 different uber uniques...
IF we use the 2% drop rate of uber uniques, coupled with 7 different uber uniques, the probability of finding a specific uber unique (shako for example) is approximately 0.29%.

Also, if you play in a group of 4, it might skew the data because some of your group mates might be getting lucky drops and siphoning your uber uniques.

another 250 runs.....got me the staff and another ammy.

Got all my 7 wonders!!!!!!!! GL to all that are still in the hunt for their precious