Bank Boxes

[Fatal]

Hello,

I cannot find any UISkins except "ID_UISkin_GamePlay_BankBox" in the SkinDictionary to modify the Bank Boxes.
The mentioned UISkin seems to effect the "main big box" only. What about the other 6 additional Bank Boxes?

I want the boxes to be minified - it works for the big box though.
But I don't know how to address the other 6 bank boxes.

Thanks for any help.

Greets Fatal