Boxed in, investigated the possibility of stealing (5)

I believe the answer is:

cased

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'boxed' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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

I've seen this clue in the Evening Standard.

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