Some of my benchmark knowledge:
The benchmark on Frye Mountian is not registered with the NGS. It was probably placed by someone surveying the area, possibly to place the tower. Many times a benchmark is only registered if it is used for city or state use, like laying out roads and such.
If you want be a benchmark addict, there is a utility at
Fuzzy's Geocaching Page o' Wonders called bmgpx, which will convert NGS data files into GPX files, which will be viewable with GPX software, like Watcher, GSAK, and cachemate.