What to do with these

[cubbs1232]

Ive been helping a friend clean out his collection and we came upon some nameplates off of jerseysand im not sure what to do with them. They are Julio Franco Tony perez and Robbin Roberts, unfortunately none are still with their jerseys.
He wants to sell everything but im not sure a.) if i should sell these as they could help someone fake a jersey b.) value of them and c) how i could authenticate them. So any opinions? Thanks