Just curious about bats that have ink impressions from World Series baseballs on them. Does they mean the bat was definitely used in a game OR do they use the same baseballs in World Series BP?

Seems to me you can't call a bat a World Series bat, and charge for it as so, if the same balls are used in BP as you dont know if its a BP bat or a bat used in a huge game (big difference).

Anybody know if those World Series balls are used in BP as well, or just World Series games?

Thanks