'trapped in a box' is correct and usable in written English.
You can use it when trying to describe a situation where someone is being confined or isolated. For example: "The victim was trapped in a box for days without any food or water."
However, these same staff members are trapped in a box.
"I find prison hard to cope with, being trapped in a box," Ward wrote.
I'm trapped in a box!" he squeals, and there hovers the thought that maybe Coogan is a man trapped in a box, for ever unable to escape the association of Alan Partridge.
Suffering from body dysmorphic disorder (BDD) was like living trapped in a box lined with distorting mirrors.
As for actual symbology, there's a fabulous moment when Mal'akh has Langdon trapped in a box that is rapidly filling with water.
If one thing has been the abiding deal with us, it's that we have not wanted to be trapped in a box.
Despite his traditional white mime's makeup, Billy is obviously no trapped-in-a-box street mime; he was, in fact, the mime in the coarse-joke movie "The Aristocrats".
They just look like a load of weird insects trapped in a wooden box.
As with the stories in the "The Library," not all acts could be considered equal, but in the excellent "Temporarily Untitled," Simon Courchel appeared trapped in a wooden box that extended to his chest.
"Basically what you're asking them to do is to sit trapped in a moving box and be strapped in for hours at a time, and that's tough for kids".
In the movie, the Monkees are hoodwinked, bamboozled, chased, assaulted, mocked, trapped in a black box and reduced to dandruff in the hair of the actor Victor Mature, before ending up back where they started.
