Updated Information
Hubert had told them why they really went to the park that day and the Chief knew that this would make it much easier to narrow down where Austin went missing and thus narrow down their search.
The pair had gone to find and illegally harvest wild ginseng that day. Hubert finally admitted this and handed them the plant. They only had to take one look at the piece of contraband to know this is what they needed. The Chief Ranger immediately called the local guides who would know exactly where to start looking based on this new information.