I am assuming that there are many Disney guests that don't even pay any mind to DME's luggage handling hours, and therefore people who arrive after 10pm and before 5am use the yellow tags and don't pick up their luggage and don't give it a second thought. I would have to guess that DME has some measures in place to handle that, or perhaps airport employees are instructed to do something with those bags. I would think the bags would still end up at your resort, but maybe later than normal. All of this is pure speculation my part, but I'm just thinking of my clueless friends and family that would unknowingly do something like that.