I thought it was so strange that LE wouldn't identify the drop-off destination, so I asked my husband who's retired LE. He said LE wouldn't want to give out that info unless they needed the public's help, especially if the destination included a suspect. They wouldn't want the suspect to know at this point that they're looking at him. In an active investigation like this, they don't want to give out too much info and have the public interfere or show up at the site. So, I go back to believing that LE has much more info than they are revealing and maybe have revealed this info to the family, which is why they aren't rushing out to SLC. They obviously don't need the public's help at this point and see it as a possible obstruction to their investigation.
...except they are asking for help YOUNG WOMAN VANISHES: Police turn to public for help as search for missing university student intensifies