Adding non-PSA certified items to a showcase, not a registry set
I am building a showcase for the [Boston Red Sox Hall of Fame].(https://www.psacard.com/psasetregistry/showcase/miscellaneous/complete-boston-red-sox-hof/10541).
I want to add an item that is part of this collection but has not been authenticated by PSA. Specifically a book called "Baseball for Boys" by George Digby. Mr. Digby was a scout for the Red Sox for 60 years and was inducted into their Hall of Fame. Is there any way for me to do this without getting it authenticated? It isn't valuable, just something to put in there to represent Mr. Digby. The showcase is non-competitive...just for fun.