Assuming that an informant shared the information leading to the inquiry, and/or there was no written report or other document to be shared before the dismissal, the prosecution would have no obligation to share the location.Do you know if this investigation/lead would have been discovered to the defence?
It would seem absurd if it was, because the accused might be able to destroy evidence.
"Rule 16 - Discovery and Procedure Before Trial, Colo. R. Crim. P. 16
Part I. Disclosure to the Defense
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(e) Matters not Subject to Disclosure.
.....
(2) Informants. Disclosure shall not be required of an informant's identity where his or her identity is a prosecution secret and a failure to disclose will not infringe the constitutional rights of the accused. Disclosure shall not be denied hereunder of the identity of witnesses to be produced at a hearing or trial."
Of course, the person who disposed of SM's remains would know the location. My guess is, there are quite a few trail cams there, and along the approaches. Just in case.