In my view,not all agent that doing their mission will not leave traces behind..
Elite rank agent such as gin or if gin himself is the one who lead the mission,will not do this mistakes to leave a simple particular evidence .we can see from the Itakura case,when conan face to face with vodka,if gin is not there,vodka fingerprints and saliva will be send for further investigation..and not to forget if not for gin,their hidings also might be exposed because conan attached a following device also.
Vermouth also have done a mistakes in the past by not killing jodie,plus she left her fingerprints also by touching jodie's father spectacles with bare hand.
So,there might be a lot of other mission that was not reveal to us that other BO agent might do the same mistakes.
Just some random thoughts