The ornamental design for a padlock casing, as shown and described.
FIG. 1 is a perspective view of the padlock casing of the present invention
in the closed configuration;
FIG. 2 is a perspective view thereof in the open configuration, the broken
line showing of a hasp, staple and padlock being for illustrative purposes
only and forming no part of the claimed design;
FIG. 3 is a perspective view of the rear portion thereof with the front
portion omitted for clarity and with the broken line showing of the staple
plate and staple retaining the padlock casing in place being for
illustrative purposes only and forming no part of the claimed design; and,
FIG. 4 is a front view of the rear portion thereof, the rear view identical
.