A retainer for use with a staple cartridge that is configured for use with a surgical stapling device is disclosed. The retainer comprises a retainer body that is configured to be attached to the staple cartridge to form a cartridge assembly. An authentication key is movably supported on the retainer between an actuation position wherein the actuation key can defeat a lockout of the surgical stapling device when the cartridge assembly is seated in the surgical stapling device and a retracted position when the retainer is detached from the staple cartridge.