[whpalmer4]

Even if you can't see the offending object on the Fit in Window view, you should be able to see the outline of the canvas page(s) that it sits on that causes the whole document to be larger than expected, right? I'm assuming you have the auto-adjust the canvas size box ticked.

Another approach would be to use the Selection inspector to see if you've got some unexpected objects floating around, and possibly a quick application of color (which you can undo after you've spotted the culprit(s)).