The Penguins did well in bringing in Brian Boyle on a professional tryout contract back in 2021.
Boyle, coming off a full season in which he didn't play anywhere professionally, impressed enough in the Penguins' training camp and preseason to earn himself a full contract for the year. He played in 66 games for the Penguins that season, scoring 11 goals and 10 assists.
Boyle earning an NHL contract has been the exception in recent years when it comes to the Penguins bringing in players on PTOs. Sometimes players on PTOs earn AHL contracts with Wilkes-Barre/Scranton, like Matt Bartkowski did in 2021.