We have been granted a backcountry permit in Yosemite. The permit allows the use of backpacker's camp sites near the trailhead on the day before and after the dates of the permit. We'd like to stay in the backpacker's campground on the night before our permit starts, but we're planning to arrive at the park after the permit office closes.
Can we use our permit confirmation to stay at the backpacker's campground or do we need our full permit?