>The bank didn't adjust the teller windows but people designed boxes to perfectly fit through the teller windows.
The one thing does not exclude the other.
It is entirely possible that previous windows were too small and, after they were enlarged, in order to optimize the deposit operation some special boxes were put in use.
Possible, but that set of facts do not appear to be alleged anywhere. If this was thought to be true, it would have definitely been alleged in the prosecution agreement.
The Guardian published something [0]:
>In some branches the boxes of cash being deposited were so big the tellers' windows had to be enlarged.
Rolling Stone published something different [1]:
> ... Breuer admitted that drug dealers would sometimes come to HSBC's Mexican branches and "deposit hundreds of thousands of dollars in cash, in a single day, into a single account, using boxes designed to fit the precise dimensions of the teller windows."
The one thing does not exclude the other.
It is entirely possible that previous windows were too small and, after they were enlarged, in order to optimize the deposit operation some special boxes were put in use.