Sales of the Verizon iPhone have been slower than what Apple and Verizon expected, according to a new report. Citing an Apple source, BGR reports that combined unit sales totals from five Apple stores—including two described as “very, very prominent” locations—fell between 660 and 916 for each of the first five days the Verizon iPhone was on sale, compared to sales of between 471 and 701 for the AT&T model over the same…