The league winner earns a spot in the Founders' Cup, the national championship of Junior B lacrosse in North America.

Seneca finished as Silver medalist at the 2014 Founders Cup, falling 14-7[4] to the Ontario Junior B Lacrosse League champion Six Nations Rebels.

Fédération de crosse du Québec (FCQ) member teams Montreal Jr. Shamrocks and Vermont Jr. Voyageurs are not eligible to represent the FNLA at Founders Cup.

Seneca repeated as league champion in 2015 winning the two-day playoff tournament on July 24–25 at Cattaraugus Community Center.

The WarChiefs defeated Tonawanda Jr. Braves 29–3 in a semifinal before downing Onondaga Jr. Redhawks in the championship game.