You need to make sure you ask for a receipt marked for placing a concealed weapons ad and it should be signed by the person taking the order and your money.
I put my ad in the Dover Post in Kent County and it is a Cash Receipt with the Dover Post and their address, showing the amount paid , the date, and signed, also they send me a certified letter showing the date the ad was published and a copy of the ad, and the cert was signed by the ad manager and notorized. Very professional, and only $30.00.