For what it's worth....... Several weeks ago I was up there and our group became seperated due to various hiking speeds and I was stopped by a ranger around Outppost camp. I was asked for my permit and realized another member who was some distance behind me had it in his pack. I explained this to the ranger, received the "stink eye" and was verbally admonished. While this is a very explainable situation due to the method of permit distribution, a Xerox copy at 8 cents each, might be worth the time and save you some heartache if you're stopped.
P.S. - 2 trips in 2 months. Stopped both times.
Enjoy your trip,
JB