 The boxing is carried out by Cavil.Later, when the Cylons split over whether or not to seek out the Final Five Cylon models, which they learn are in the Colonial fleet, the Number Twos, Sixes and Eights (except Boomer) call for the Threes to be unboxed to end the deadlock.In the episode "Faith", the hybrid says "The missing three will give you the five who have come from the home of the thirteenth".