Boxing is at the transcriber’s discretion. I can understand why you might want to box these, but given that they appear on every page, a cell 5 heading is probably enough of a distinction for the reader. Putting a box (or sometimes two) on every page might be distracting and will certainly add a lot of space. However, if you feel strongly about boxing them given the material (since you see the whole document and I see only two pages), boxes ARE allowed for this type of material.
Cindi