Security devices including a lock, shroud, and plug are described. In embodiments the security devices include a shroud that includes a shroud sidewall having an inward facing surface and an outward facing surface. The security devices further include a lock that includes a barrel, wherein the lock is integral with or coupled to the shroud to define a shroud cavity between an outward facing surface of the barrel and the inward facing surface of the shroud sidewall. The plug includes a proximal end, a distal end, and a plug sidewall receivable within the shroud cavity. The plug sidewall includes an inward facing surface defining a plug cavity configured to receive the barrel of the lock therein. Such security devices may be advanced from an assembly state to an unlocked state, and may then be reversibly moved between the unlocked state and the locked state. Security device kits are also described.