I just got off the phone with Canon's Chesapeake location and reported the one serial # as stolen. Unfortunately, they scrapped the other sticker off and so it's impossible to know what it was. Included are photos I took this morning of the tags or lack there of. You can see the indent in the box where they scrapped the sticker off. That was actually the first one I received. The second box still had the sticker on it.
How about the serial on the lens boxes inside the cam boxes? I'd report those too! They might be able to link the missing 5d3 to the 24-105L it was paired with.
At least I THINK there's a serial# sticker on the lens whiteboxes--that's what I recall from my own experience.