Whoa whoa guys! Hold on!
First off, I found the EXACT SAME MOUSE (verified Microsoft part number) at Target, $22.42. Bleh. $6 wouldn't pay for the effort and extra gas.
Second, I would've switched the molded plastic casing that contains the mouse, CD, and documentation, with like for like. The ONLY difference between the mouse and the box would be the printed serial number on the box and on the mouse. As I said previously, Microsoft is phasing out the (and here's where my mistake in my previous occured) corded optical mice, moving to the cordless optical mice (such as the blue you saw). Yes, you may've seen corded mice still on the shelves, but once they're gone, they're gone. The only corded optical you should expect to see is a cheaper version of the Optical 3-button mouse to replace the low-end ball-mouse you most likely saw for around $15.
...and if you want to talk about fraud, let's talk about the 4mm customers a year who return 'new' items, used, in closed packaging for a full refund, only for future customers to return home with an obviously used item. THAT is sick. I've had this happen many times to myself, and in my previous life as a retail salesperson, had to learn to open the returned item completely to insure it hadn't been used (with the exception of 'it's broke').