Im guessing on this but would say they didnt have time to build crates for them at toward the end of the war. I would think it would be a low priority and waste of man hours that could be used for other things like building more war materials.
plus in this state it looks largely complete, i know from a crate there's not a massive ammount to do anyway but here it's just a case of bunging the wings, prop and tail on then you're good to go! well not quite but you get my drift.......