For example, a first retaining tab may have a first (curved) surface and a second surface substantially parallel to the face of the card, wherein the first surface restricts movement of the padlock in a direction parallel to the face of the card (i.e., prevents the padlock from moving side to side) and the second surface restricts movement of the padlock in a direction orthogonal to the face of the card (i.e., prevents the padlock from moving out, away from the face of the card). Once the padlock is placed in the aperture and the back plate is attached to the card, the padlock is secured (e.g., between at least one retaining tab and the back plate) and ready to be displayed (e.g., on a hook, on a shelf, on a display rack, etc.).