Shun Cheung , Sep 24, 2010; 09:30 p.m.
The file name number means nothing. You can manually use some number as the file name, copy that file onto the CF card, and the camera will increment that number for the next image file name. That can easily be manipulated.
Nikon can certainly reset the shutter actuation count. However, it is not so easy for an individual to do that, but clearly that is possible with the right tool or the right hack.