It may be, because it's believed he was last seen in Vegas.
Frankly, I'd be searching around St George, too. The home Steven lived in, is on the edge of town, against the hills.
As for news coverage:
I think it depends which newspaper you read, TV station you watch or what you pay attention to. The Salt Lake Tribune has had more stories than anyone else; the Deseret News, I've only found one (and a mention in a Powell story). ABC-4 had an excellent interview with Steven's parents.
The St George Spectrum had one story on Dec 24th, with an info panel:
http://search.thespectrum.com/sp?aff=1100&skin=100&keywords=Koecher&x=6&y=18
There's a local news magazine http://www.todayindixie.com/ owned by the publisher of The Clipper (the Davis County newspaper Steven's dad is exec editor of). When I search for "Koecher" in their search box, nothing turns up.