A merchandise security kit includes a tag body, a first tack adapted to be removably attached to the tag body to form a first reusable hard tag that is limited to electronic article surveillance (EAS) capabilities, and a second tack adapted to be removably attached to the tag body to form a second reusable hard tag that is provided with both EAS and radio frequency identification (RFID) capabilities. The tag body comprises a security inlay that is disposed within a protective casing, the security inlay including an antenna and an EAS marker. The second tack comprises an enlarged head, a sharpened pin connected to the head and an integrated circuit (IC) chip embedded within the head. With the second tack attached to the tag body, the IC chip either conductively or reactively couples to the antenna in the tag body to provide the second hard tag with its RFID capabilities.