uh, if you're really worried about it, just flip to the last page of your test booklet on saturday. You still gotta answer the questions, # passages won't make a difference if you're aware of it when you start.
EDIT: Also it should be noted that the directions on the cover of the AAMC tests says "There are nine passages." So you'll see on the cover page of the verbal whether or not there are 9 passages.