A theft prevention assembly comprising: a package for packaging an article, the package comprising a packaging material defining a preformed integral base structure, and an alarm-signaling device for being mounted to the base structure, wherein the base structure of the packaging material defines a cavity for receiving and nesting the alarm-signaling device, the alarm-signaling device comprising a main body having a top surface and a bottom surface and including a median contour wall therebetween, wherein mating elements are formed on the median contour wall, wherein the cavity is bounded by a border wall defining an inner wall surface, the inner wall surface including mating elements for mutual engagement with the mating elements formed on the median contour wall of the alarm-signaling device, such that the alarm-signaling device is snap fitted into the base structure of the packaging material, wherein the bottom surface of the alarm-signaling device comprises a detector and wherein the base structure of the packaging material includes a floor defining a junction at which the article and the detector interface, wherein the detector comprises a light capturing element, wherein the junction comprises an opening or a window formed in the floor which exposes a portion of the article within the package, wherein operative communication between the detector and the article is provided by the foregoing mutual interfacing at a distance therebetween that blocks light from passing through the opening or window and reaching the detector, such that the detector provides for detecting an unauthorized distance between the alarm-signaling device and the article, when the light capturing element detects modifications in the light condition between the alarm-signaling device and the article, wherein, when the unauthorized distance is detected, the alarm-signaling device signals an alarm indicative of attempted theft. a package for packaging an article, the package comprising a packaging material defining a preformed integral base structure, and an alarm-signaling device for being mounted to the base structure, wherein the base structure of the packaging material defines a cavity for receiving and nesting the alarm-signaling device, the alarm-signaling device comprising a main body having a top surface and a bottom surface and including a median contour wall therebetween, wherein mating elements are formed on the median contour wall, wherein the cavity is bounded by a border wall defining an inner wall surface, the inner wall surface including mating elements for mutual engagement with the mating elements formed on the median contour wall of the alarm-signaling device, such that the alarm-signaling device is snap fitted into the base structure of the packaging material, wherein the bottom surface of the alarm-signaling device comprises a detector and wherein the base structure of the packaging material includes a floor defining a junction at which the article and the detector interface, wherein the detector comprises a light capturing element, wherein the junction comprises an opening or a window formed in the floor which exposes a portion of the article within the package, wherein operative communication between the detector and the article is provided by the foregoing mutual interfacing at a distance therebetween that blocks light from passing through the opening or window and reaching the detector, such that the detector provides for detecting an unauthorized distance between the alarm-signaling device and the article, when the light capturing element detects modifications in the light condition between the alarm-signaling device and the article, wherein, when the unauthorized distance is detected, the alarm-signaling device signals an alarm indicative of attempted theft.