It absolutely is…
A full clearance of Iben Fahd’s Sanctum requires 377 keys and that is 25 chests.
So, from the post above…
250 chests is 10 full runs of 377 key runs, i.e. a total of 3770 keys.
There’d still be roughly 1 in 100 players wouldn’t get the item after that.
Bad luck is not a bug.
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