Tuck and Fold into Slot?

[lthake]

Does anyone know what this is called, or how to do it? Trying to find a tutorial and I don't even know how to describe it. 

[Monika Gause]

I don't know what it's called.

But this is how I would build it:

https://shared-assets.adobe.com/link/ceb62ed7-6553-474b-54a9-1edf0f55ed5a

Take a look at the gradient panel for that background thingy.

You still need to add some shapes for the gloss and shadow on the blue thingy.