here is a link to an informative document (.pdf) created for others in your position by the Casino Collectibles Association (CCA).

https://ccgtcc.com/documents/1351/Selling-Casino-Collectibles

It is quite possible that at one time he may have been a member of the CCA. Was "Russell" his first name?

Jim Follis
Vice President
Casino Collectibles Association
VicePresident@ccgtcc.com