Well, while I understand what's been written above, if you really want the fact that the box, having been opened is actually not where we thought it was when the blade cuts it, then using the slug line indicating a location change sort of blows the surprise.
It blows the surprise for the reader not the eventual movie audience.
Yeah, sure, we're not writing novels, but what we are trying to do is duplicate, for the reader, the experience of watching the movie.
True, however, every scene in a screenplay must begin with a scene heading (slugline). So how do you hide the location from the reader?
I've gotten into similar discussions when the question comes up in which a character appears, say, in disguise at first, and then reveals himself to be somebody else for the majority of the picture -- say he doesn't even have a name when he's first introduced -- just sort of bum -- do you introduce him as the character we're going to later know him as -- or as "A BUM" -- I think it's pretty obvious. If the audience is going to think that he's just a bum, then that's how you should identify him, until his true identity is revealed, and then change his identity on the page.
Yes, but, we describe the character's appearance in the action/description which allows us to reveal who the character really is, when we want to.
We're stuck with scene headings for locating scenes.
The way that you might address the problem that you're facing -- again, presuming that this is really a story point and not just some little visual flourish that you'd like to stick in --
You can use a shortened slug line.
INT. CANDY'S APARTMENT - DAY
Candy picks up the cardboard box, stares at it, anxiously.
ON THE CARDBOARD BOX
The exacto knife slashes along the seam. It pops open, revealing its contents -- a complete set of first edition Mad Magazines. A hand reaches in -- but it isn't Candy's hand.
INT. THE OFFICES OF BIZARRO WORLD LTD. - DAY
It is now revealed that the box is sitting on the desk of MAX BIZARRO, president of, etc., etc. --
You can do something along those lines.
How did the box appear in Max's office when Candy had just stared at it in her Apartment?
NMS