Yes - in episode 17 of the show the number on the door to the parlor room is 07151129 and in this episode it's the same exact numbers. So those numbers were the code to a bank vault. If you look back on that episode Eva was actually copying down the numbers on the door, so she probably didn't even know about this entire "Beatrice sending letters" scheme.
Jessica is trained in boxing from the looks of it.
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