Rickochet PGA Tour tournaments provide balls from the manufacturers and players hit the balls they play. At times have seen the signs for balls on the table for players to pick up, but typically can't tell what they are hitting. Once the pundits talked about how they noticed Folwer changes balls by the ones he selected at the range table during a tournament.
I always assumed with the caddy giving them balls for the driver is those balls are not hit by other pros on the range, but new since free.