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| p.1 #2 · Assistance With Shutter Count: 1D Mark III |
AFAIK, only the Mother Ship (i.e. Canon) can do this for Mk III and newer 1D-series cameras. IOW, if somebody offers to give you an answer for $, then you should not listen to them, nor should you pay them.
P.S. If somebody asks, tell them ^, and provide your best guesstimate of the shutter count - and tell them it's a guesstimate. Best you can do, on your own.