You'd rather they wrote in complete sentences?
I.7.8 (bar; left of the door); 8162: We two dear men, friends forever, were here. If you want to know our names, they are Gaius and Aulus.
I.10.4 (exterior of the House of Menander); 8304: Satura was here on September 3rd
V.3.9 (House of Cosmus...