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I am assuming that at the stage the sound rushes were imported into Final Cut Pro some kind of automatic pull-up / pull-down should have been carried out, but unfortunately it hasn't so this will need to be fixed by us in sound post.
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Maybe, but based on what you said I don't think that is the problem. If this were a "video speed" vs. "film speed" issue, the amount of drift would be much larger, around 7 frames in 5 minutes, not 2 frames in 5 minutes. If the audio recorder was not actually sychronized to the camera on set, it is possible for such a drift to occur. That is a big drift for modern equipment, but not outside the realm of possible.
One way to deal with it is to make edits in the audio, either snipping out tiny bits or adding tiny bits on a regular basis, every 30 seconds to a minute. If the material does not allow that, like a musical performance, then you'll have to find the correct amount of speed change/pitch change for a longer take, either by experimentation or with a calculator.