Player #30 is recorded as F. Casey in Wests Heritage List and the Rugby League Project.
The Rugby League Project also lists this player as Robert William Casey who played for Cumberland Rugby League Club in 1908.
Robert Casey had a brother named Richard Casey. It was likely that the relevant player was one of these two brothers. There is little doubt that the player that played for Cumberland was the same player that played for Wests in 1909.
A search of available records concluded that Wests player #30 was Richard Casey.