No use was made of the draft treaty as might very easily have been done and we therefore came to the conclusion that Danvers had, after all, destroyed it.
Danvers kept the draft treaty because it was useful.
mnli hypothesis: Danvers kept the draft treaty because it was useful. premise: No use was made of the draft treaty as might very easily have been done and we therefore came to the conclusion that Danvers had, after all, destroyed it.