what was the last present grayson gave to maniac?

From the text:

Maniac tore it open—and gaped helplessly when he saw what it was. To anyone else, it was a ratty old scrap of leather, barely recognizable as a baseball glove, fit for the garbage can. But Maniac knew at once this was Grayson's the one he had played with all those years in the Minors.(31)