As written in Enlarge description :
Any enlarged item that leaves an enlarged creature’s possession (including a projectile or thrown weapon) instantly returns to its normal size.
So what about a +1 returning dagger, is it leaving possession of thrower and thus shrinks before returning to its owner at before his next turn? Let's say the owner can catch the returning dagger without trouble.
Then what about hand of apprentice? It seems to me the hand allows mages to retain possession (that is ownership) of the weapon since there is no possibility for mages to lose the weapon, hence no shrinking and larger type of damage.
Or am I misunderstanding the meaning of possession?