Apparently a clerk at the Hamilton store says it did not happen there, and a Hamilton police officer reportedly said it happened in CA.
http://nj1015.com/nope-good-guy-with-a-gun-who-opened-up-on-robbers-wasnt-in-nj/
http://nj1015.com/nope-good-guy-with-a-gun-who-opened-up-on-robbers-wasnt-in-nj/