Bandalier of Daggers

This bandalier of a leather darkened in ways most would not want to think about judging from the hue, carries 4 daggers of magical +1 innately bound to the item.  Daggers bound to this item will reappear after 6 seconds to their respective sheathes or if the user wills it whenever they want it to but does require concentration to keep the dagger out and loged wherever the user threw it last.  This effect is not present when being used in combat but only when dropped or thrown.  You can also use a bonus action to sheathe all daggers simultaneously that are outside their sheathes.  In addition you can 'bound' a dagger to the bandalier that will replace one of the daggers already bound to it.  Daggers bound this way are not lost and can be unbound doing the same process to bind them which take a short rest worth of concentrating on the bandalier.  The magical daggers that dissappear will reappear when the dagger is unbound.