need help for client project

Something that might be a better fit for a situation like this is a Displacement Map.  DP Maps work by distorting the layer they are applied to down where the map is black, and up where the map is white.  We just need to curl the end of the graphics down, so I have made the soft black brush strokes below in a new layer.

I right click the layer and choose Duplicate. In the dropdown, select New. This will create a new document, which you need to save to a known location as a .PSD file.

Turn off the Displacement Map layer, as we don't need that any more.

Now go Filter > Distort > Displace which opens this dialog panel.

We don't need to go crazy, so I used values of 4 and 4.

When yoou OK this, it will ask for the displacement map file, which is the new file with the black shading lines we just saved.

Which gave me this result

We can often use the map files as shading. In this case I inverted the map layer making it white, set its blend mode to screen, and reduced its opacity.

An example of what we can do with displament maps and some shading.  This flag is 100% photoshop, and the Smart Object layer which is the combined flag layers is a rectangle with perfectly straight sides.  

I would recommend applying Warp to a Smart Object. 

for additional small crinkles the Filters Liquify or Displace could be used. 

It's a tricky one because the puches are three dimensional. 

What I would do with an object that had flat sides like the box below, is to make a temporary layer the same size as the panel I want to put the text on.  It create the text and position relative to the temporary layer.  Select both layers and make them a Smart Object

Double click the SO to open in a new window (to edit it) and turn off the temporary layer.  Ctrl S to save.

You can then Transform the SO and move the corner handles to fit the box end (Hold down Ctrl or Cmd)

Because it is a Smart Object you can fine tune if needed, and the handles will remain in their corner positions.

In your case, the area with the graphics is basically flat, but clurls towards the outside, so you could use shading to give a 3 dimensional feel to it.

Because that panel is angled out from thge top, there would be a tiny bit of foreshortening

I suspect you are worried about how the outside of the graphic would curve slightly downwards at their outsides.  I think the effect would be minimal though.

@Muhammad Sattar I dunno why, when I thought Adobe Ilustrator would have been ideal for the mockups Beta for your packaging.