Take the polygonal lasso tool, selecth with it the front panel, make a new layer, paint the selection.
Then goto Edit > Transform > select > Free transform or scale and drag the painted area smaller. Hold shift to keep the proportions. Move the new tag to the wanted place:
Now it's possible add some thickness by painting a darker and a lighter stripe around the tag. Use the polygonal lasso tool and paint the selections. You can also add some text. You can drag the text to fit to the tag by distorting it Edit > Transform > Distort:
Do not expect anything small to be readable in this low resolution. I think that you do much better by drawing your box in Illustrator or inkscape. It's trivial, if you use a photo as a reference.
This is an example from Illustrator (random colors, random dimensions, drawn from scratch, without an underlying reference.)
You can use the creation as vector or you can rasterize it to any pixel dimensions without losing the sharpness.