The front of the box is simple and meant to draw you in. There is very little here other than that it is made by Corsair, is an 800W unit, and what the PSU looks like.
On the back things get a little more complicated. Corsair throws almost all of the information on the GS800 here including power ratings, connector availability, and main features.
Oddly enough, the only place that Corsair displays warranty information and the 80Plus logo is on the top of the box. Most would find this information important enough to have displayed on the front or on the back with the rest of the other pertinent information. The sides simply display the tri-color fan and the model of the power supply.