American Papist reports (link), you decide.
My own two cents: this is plainly superstition. The Giants' victory had nothing to do with a scrap of metal in someone's pocket. I doubt the American Papist would be willing to debate the topic of: "Resolved: that blessed medals are effective for winning football games."
Nevertheless, we have amazing anecdotal evidence to support that resolution. The Giants were thought by the masses (hoi polloi) to be the underdogs, and yet they won. One could point out that the other team's star player had been nursing an ankle injury in the week prior to the game, but that would just show lack of faith in the church. So don't. Instead, believe that rubbing the medals and praying to whoever is depicted on them won the biggest sports game of the year.
I wonder if they work for Hockey too?