We claim the ornamental design for a toilet seat hinge post, as shown and described.
FIG. 1 is a top plan view of a tiolet seat hinge post embodying the invention.
FIG. 2 is a side elevational view of the hinge post shown in FIG. 1, the opposite side elevational view being a mirror image thereof.
FIG. 3 is a front elevational view of the hinge post shown in FIG. 1; and,
FIG. 4 is a perspective view of the hinge post shown in FIG. 1.
The bottom view is not part of the claimed design. The aperture shown in broken lines is for illustrative purposes only and forms no part of the claimed design.