Signed by 16 cast members:

Steve Carell, John Krasinski, Jenna Fischer, Raine Wilson, Brian Baumgartner, Kate Flannery, Creed Bratton, Mindy Kaling, Ed Helms, Paul Lieberstein, Ellie Kemper, B.J. Novak,  Oscar Nunez, Leslie David Baker, Angela Kingsley and Phylis Smith. 

https://www.ebay.com/itm/363647517125?mkcid=16&mkevt=1&mkri...