Re: I've often wondered...
They won't know for sure. But the "experts" reviewing the code are also looking to see if what they are reviewing seems out of place in some manner. If they can make a case that Apple gave them incomplete materials, there are other steps that they can take in court. However, for these kinds of lawsuits the probability of the respondent not producing the full set of materials is low. There is little to be gained from gamemanship, except the disfavor of the judge.