embox

From em- +‎ box.

embox (third-person singular simple present emboxes, present participle emboxing, simple past and past participle emboxed)

1. (transitive) To enclose in a box, or as if in a box.

• “embox”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.