Artifacts to look for at Arrowhead Stadium?

Arrowhead Stadium is a venue in or near Kansas City that is most often used for Football

They have retired numbers of Chiefs' greats on the walls of the inside of the stadium. They also have banners with players faces on it and the giant arrowhead signifying the native american tribes in Kansas. I hope they get a Derrick Thomas statue eventually but overall they are lacking in artifacts for their storied franchise.