Once you get to Camp Quigley, via the Jeep's GPS, the Hardy Boys will call you up and tell you that the road has been blocked. On top of that, it seems your jeep is stuck in a ditch.
So it's time to look around camp. It's in terrible disarray and you'll need to look for items left behind. Take note of the winch by the Jeep - that will help you get the jeep out of the ditch later. Before heading into the tent, grab the tape recorder by the bushes and listen to the last recording.
Blee - Blah - Blih - Bluh - Bluh - Blah - Blah - Blue
This will be a sequence you need to take note of to open the chest in the tent. I've included the sounds that each button will make in this article to make it easier for you. Once you've opened it, grab the journal and read the contents (and take note of the phone number there), the hook which you'll need to move the jeep and the Hilihili Centery Security Pass you'll use later on.