Pretty much this. I received my preordered Nexus 7 on Tuesday and found it no more difficult to open than my original Asus Transformer tablet. The top and bottom of the box fit together very snugly, as in I could feel the low air pressure inside making the box more difficult to open, but didn't provide and particular challenge. Perhaps people should try poking an air hole in their box if they are really having that much trouble.
I had supper with my brother Tuesday night, and he asked me if I'd had any trouble opening the Nexus 7 box; he'd apparently seen the videos referenced in TFA. I showed him the box and he wasn't sure how anyone had trouble opening it either.
HOLY MACRO!