portion 14 a pressure sensitive adhesive 15 is applied to the underside of the flange portion 14 in the form of a coating on a paper layer 16 that has been fusion bonded through a heat sealing medium 17 to the material of the flange portion 14 the pressure sensitive adhesive 15 is protected by a layer 18 of release paper and serves upon removal of the release paper to bond adhesively the enclosure 10 to the flat surface of an article such as the record jacket or envelope 11 the central portion 13 of the enclosure 10 has a contour in plan which corresponds to that of the detectable component 12 in this example the configuration is generally right rectangular with the exception of the taper provided by the angled walls 19 and 20 at one end converging at an intersection 21 the central portion 13 has a ceiling 22 whose interior elevation as measured from the underside of the flange portion 14 exceeds the thickness of the component 12 by at least a few mils the criteria for such elevation will be evident from the ensuing discussion in any event the exterior elevation of the central portion 13 should be sufficiently low as to resist grasping by human fingers it is desirable that the enclosure 10 be formed from a tear resistant plastic material which is severable by a razor edge implement to permit authorized extraction of the component 12 therefrom it is presently preferred to vacuum form the central portion 13 and flange portion 14 from an integral sheet of a polyester resin suitable enclosures have been produced from 34.