Actuation count foolproof??

I wouldn't say it was foolproof, but the D3's shutter is rated to something like 300,000 actuations, so unless it's been getting some serious abuse, it's not likely to be a problem.

I'd certainly use the actuations as a guide, and you should also be able to look at the firmware version as well, which may give you another indication :)
 
As far as I know the shutter actuations cannot be changed - but don't confuse that with image number which can be reset.
 
I was reading on a nikon forum that when some repairs are carried out by nikon that the shutter count is reset.
 
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