Originally Posted by Opalia24

The R and SR items in the boxes do not show up so often in a box unless you already cleared all the normal stuff.
So a player with normal luck will have a box full of mostly SR-item when it is close to being finished.

So normally, the platinum box gets better the more times you draw from it.
For most players it is best just to draw from platinum box until it is empty. I would newer reset platinum box until I got the platinum SR-girl at least once maybe you have to draw 294 times to get her.

I only reset my Platinum Box if most of the following happen:

1. I have drawn all the cards.
2. The amount of N-Rewards outnumber the R+SR-Rewards by 2 to 1.
3. There are less than 5 Pudding rewards between full and halves.

While Peronamin is useful, and more Pero is never bad, the real prize of this box are the cards, the SR WCs and all the Pudding you can accumulate for next Guards Event.
As such, I just make sure I have good odds of drawing those.