For the shutter actuation you'll need to shoot a jpeg file and look at the full exif (I use MacMetaSHow from fellow Nikonians). The shutter on this camera is healthy and shouldn't be a problem even if it has been used well. Check the contacts and try a lens or two for the AF. Take a small torch to check the pins in the cards slots. Check also the battery comportment and if the compartment lock works properly (the clock rewind sort of key should be firm). Check the button for the metering choices on the prism, verify it shows the modifications in the finder (some of those can be stuck on one metering favored by the decedent user).