I am the guy who opened 2 mythics in 9 big boxes! AMA

It depends what you mean precisely.

The overall chance of opening the same mythic you got in a previous box (or any other given mythic) in a future box increases as the overall number of boxes you open increases.

But the chance of getting the same mythic in BB #2 that you got in BB #1 is identical to the chance of getting the same mythic in BB #3 (or any other box) that you got in BB #1.

There’s no evidence of that. And if we assume pure randomness then it’s exactly the same.

What we were calculating was just pulling mythics, completely ignoring any other cards. It also ignored how many boxes you bought.