It's Gwyneths head, which sygnifies that Spacey's character was guilty of envy, which then made Pitt's character guilty of Venveance???, perhaps???, anyone???
Yep, it was Gwyneths head. Because the killer envied her normal life, she became the envy victim, which then made the killer himself the wrath victim, but only if Brad killed him.
Thats why Morgan freeman was telling Brad not to shoot him, because he'd [Spacey] win.
It's actually a pizza, Beth. The bit I don't think adds up is the distance the delivery man travels with it. Round here they usually stipulate 5 mile radius. Sorry....is this a genuine question, and NOT a wind-up. Nobody could possibly have watched that film and NOT known what was in the box.
There aint a version in which you see what's in the box.
It's Gwynnies head in the box, (you can see wisps of her hair) but it's up to the viewer to create what he/she see's in it, and that is far more gruesome than what they could put on film.
It's like the whole "whats in the suitcase" thing about Pulp Fiction.