Examined closely and put into a box (5)

I believe the answer is:

cased

I'm a little stuck... Click here to teach me more about this clue!

'examined' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for cased that I've seen before include "examined with intention to rob" , "Covered, protected; checked over (by robber)" , "Carefully inspected (for crime)" , "Reconnoitred (sl.)" , "put in a box" .)

I've seen this clue in The Globe and Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.