well it isn't just that. If they are going to be auctioned off for a local benefit you don't want to take any chances. Does it have to be sport? How about music as well then you will get more bidders if you have a mixture? Out of interest whats the benefit?
I do not work for steiner but they are having a sale right now and their stuff is authentic. Dont go blindly with a sticker Jsa,Psa. Though they are better with sports.