I put the boy in the box like David Blaine
Let the audience watch, it ain't a thang

from Jay Z – Threat Lyrics on Rap Genius

Meaning

By “box” he means casket. HOV doesn’t have a problem with killing the boy in front of witnesses.

David Blaine is a “street magician” who on occasion stages public stunts, including live burial (which he sustained for a week) and taking up residence in a clear box suspended over London’s Thames River (happening just before the release of the Black Album)

Blaine often performs in Las Vegas, continuing the sequence of ideas that began the verse.

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