I think the package he opened first had two sets of maps. I saw a smaller looking 54/54B map at about 3:15 and then at 4:02 there was another 54B map which definitely looked bigger.
But I see the disparity you are speaking of on the product order page between the WWII and Modern compendiums.
The Volume 2 (Modern Compendium) is not supposed to have maps (just scenarios, per the product page and verified by Gimpy at 8:00), but Volume 4 (Modern) is supposed to have maps (per product page and verified at 12:17). Although from the video I can't tell if Gimpy's copy of Volume 4 came with regular maps, X-Maps, or both.
I'll find out myself at some point...just picked up the X-Maps for Falklands and Nam, the only X-Maps I was missing of the four modern titles I have.