The Boxmaster is so-named because you eat it out of a box like KFC's Boneless Filets (which is no longer on the KFC website but is used as the "buns" for the Double Down). The Boxmaster's a bit like a KFC Twister but folded wider, bigger, and filled with more random stuff. "Stuff" includes a hash brown, cheese, dressing, lettuce, and tomatoes. It has also gone through different iterations including a fish version in France and a Texan, spicy, and BBQ version in the UK.
I'm not sure I understand the whole hash brown in a wrap thing. I think I'd rather they put mashed potatoes and gravy.