Those are empty display boxes.

; Every store has 'em. Pick them up and feel their weight if you're unsure. My local Gamestop has Wii, 360, and PS3 boxes in it's front windows too, and not a single Wii or PS3 in stock.
If a store has actual systems in stock, they won't be out themselves on the display store. They'll be in the glass case with the rest of the videogames, or behind a counter. Don't want to risk a pyramid of $600 systems getting spilled all over the floor cause some three year olds are playing tag in Walmart.