There are three conditions which have to be satisfied in order to determine the actuation count.
The camera has always been set to continuous file numbering.
The frame counter has never been manually reset.
All CF cards used by the camera have been either (a) dedicated to this camera or (b) reformatted before use in this camera.
If these conditions are met, then the file number will tell you the number of actuations as ScarySquirrel says. But otherwise there's no way of telling, short of a trip to Canon. If this is a camera you're thinking of buying, then of course there's no way of knowing for sure whether these conditions are met.
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