Spot on Dakota, average box = 7-8 wheats. Not to say that sometimes I do not come across the super box of 25-30. Those to often are few and far between.
In the 5 or 6 boxes I've plied through, I've averaged about 13 Wheaties. Though, that's a lot of Canadians compared to the 2 or 3 I'd be lucky to pull down here in Philly.