What leads you to believe that? I haven't been there but the plaque seen in the picture just says: Have you ever wondered what one million dollars looks l

What leads you to believe that? I haven't been there but the plaque seen in the picture just says: Have you ever wondered what one million dollars looks like? You don’t have to wonder anymore because you can see it right in front of you! That does not say nor in my mind even implicate that these would be valid dollars. It just wants you to be able to "see" what a million would look like. For all we know they printed fake money for it that uses the right paper for thickness and such and the right face value print but is otherwise fake. It would still meet the stated description. I would hope they at least used real bills they just took out of circulation for whatever reason but there can't be any real expectation. It's a "stunt" only anyway coz a million in $1 coins would look way different. As would a million in 20s or 100s.