How it works

The big central wheel controls all of the sides and flaps' rotation. It can be rotated both counter and clockwise, to fold inwards or outwards 

The horizontal arrows control respectively sides 1-3 and sides 2-4's size. Vertical arrows, control flaps' size on the same sides and, lastly, the lid's arrow controls its length 

There are 2 paper materials included (both Cycles and Eevee): glossy laminated and matte laminated. Both are pre-loaded in slots, so you can delete the one you don't want to use. 

Then you have to load your texture as a 2d raster image (jpg, png and many other formats are available) clicking on the dialog below the material slot

Once your texture is loaded, you have to check if the geometry matches the 2d projection, and UV-Unwrap the mesh (sorry, but this one will be automated in the future). If your design is regular (i.e. same size an all sides) chances are the UVs are already ok

Hit render and voilà!

Images included are original placeholders and a CC0 HDRi from www.hdrihaven.com 

Includes 2 .svg templates to help you create your own design

Unfolded box and customization arrows and folding knob are on render layer 1

All required drivers are on render layer 11

Deformation cube (for a more realistic -optiona- box effect) is on render layer 2

Deformation cube drivers are on render layer 3

Studio lights and background are on render layer 15