(a) A state department, board, commission, or educational institution that installs a postage meter shall place on the machine an imprint plate stating that:
(1) the mail carried by the postage is official state mail; and
(2) there is a penalty for the unlawful use of the postage meter for a private purpose.
(b) A state department, board, commission, or educational institution shall pay for the imprint plate and its installation from the state department's, board's, commission's, or educational institution's appropriation for postage and contingent expenses.