(4) The duly constituted licensing authority of any city, town, or political subdivision of this state, upon issuing a firearm dealer's license in accordance with RCW 9.41.110, shall issue the dealer signage the dealer must post in a conspicuous place at each point-of-sale that states in block letters not less than one inch in height: "FAILURE TO KEEP FIREARMS IN SECURE GUN STORAGE, OR SECURED WITH A TRIGGER LOCK OR SIMILAR DEVICE THAT IS DESIGNED TO PREVENT THE UNAUTHORIZED USE OR DISCHARGE OF THE FIREARM MAY SUBJECT YOU TO CRIMINAL PENALTIES. FAILURE TO REPORT THE LOSS OR THEFT OF A FIREARM MAY SUBJECT YOU TO A CIVIL PENALTY UP TO $1,000."