Is your game executable (FalloutNV.exe) showing version 1.2.0.285? That's the latest.
The file that won't verify is likely the InstallScript.vdf and it doesn't matter. There's apparently a log somewhere of the verify results, but I'm not sure where.
If only one file is reporting as a problem, I wouldn't worry about it. If it bothers you, delete the InstallScript.vdf and then run the verify again and it should replace it with a new one.