Children playing outside an apartment building found Heichel's phone in some bushes Thursday, and their parents knew it was Heichel's because the screensaver showed her picture. It also had text messages asking if she was OK.
Earlier in the week, a search team found tire tracks, broken glass and Heichel's license plate on Larch Mountain, where they would later find her body. Whitney Heichel's family said that in spite of their profound loss, the support they had received from their community has convinced them that there are "many good people."
"The loving concern from ones that didn't even know Whitney or her family has deeply touched our hearts," Heichel's family said in a statement. "The kind expressions, and support from perfect strangers has confirmed to us that there is much good in people. ... And though, while this event in our lives is tragic, we saw the positive effects it has had on this community."
To learn more about Whitney Heichel or to find out how to make a donation to her family, visit Findwhitneyheichel.com.
ABC News' Alyssa Newcomb and Sydney Lupkin contributed to this report.