This was apparently traced but has since been lost to the elements after exposure subsequent to the archaeological dig. This is a charcoal graffiti on a wall in Pompeii from A.D. 79.
This isn’t surprising since St Paul mentions being in a city 30 miles away.
Holy Bible (Douay Rheims)
Acts 28:13 • ‘From thence, compassing by the shore, we came to Rhegium: and after one day, the south wind blowing, we came the second day to Puteoli;’