How to withdraw 100% of the hidden money from the blind box pen?

This stationery blind box can't take out 100% of the hidden money.

Hidden money refers to a very rare style in the blind box pen with card tour, and the probability of drawing it is very low. Because the probability of hiding money is very low, it is impossible to guarantee that 100% of the hidden money will be taken away by any means. If the player wants to increase the chance of drawing hidden money, he can try to buy more blind box pens to increase the chance of drawing.