Earlier quoted context omitted.
Based on the customer service emails it looks like StubHub knew full well what was going on and aided the seller in pulling out of the agreement.
Of course they knew what was going on. A seller "made a mistake" in listing the tickets, thus the tickets didn't actually exist in StubHub's eyes and they were forced to cancel the transaction. It is impossible to know if the seller is telling the truth in this situation or not. Everybody makes mistakes, this seller just claims to have made a more costly one than usual. StubHub is a marketplace, they can't investigat…
When the reason given for the 'mistake' is obviously false, it's not impossible.
>they can't investigate every time somebody claims to have made a mistake in listing their tickets
They certainly can investigate every case of purchases in the $900+ range. You know, as part of their multiple hundreds of dollars in fees.