A fastening arrangement for releasably interconnectable mounted and mounting members with an enhanced degree of theft-proofing, includes at least one female element on one of the members and at least one cooperating male element on another of the members. The female element is preferably provided on the mounted member in the form of a receiving opening having a cross-section corresponding to that of the male element, and a transverse bore extends through the wall of the member from its exterior to the receiving opening, the bore having an inner section and an outer section of which the latter has a small cross-section relative to that of the former and is preferably located so as to be not readily noticeable. The male element is preferably provided on the mounting member and is accommodated by the receiving opening substantially without play, and a transversely movable, outwardly biased locking pin is carried in a recess by the male element in a position on the same corresponding to that of the transverse bore in the female element, the portion of the locking pin normally projecting from the male element having a cross-section corresponding to that of, and being adapted to snap into, the inner section of the transverse bore. To disconnect a mounted member from a mounting member, a thin tool is inserted through the outer section of the transverse bore to depress the locking pin out of the inner section of the transverse bore and into its recess in the male element. A method of making a molded mounted member with its receiving opening and transverse bore combination is also disclosed.