Excellent topic and find! :)
As a mostly irrelevant sidebar, the House of the Vettii in Pompeii was over a century old when it was buried by Vesuvius, but at that time was owned by a couple of freedmen. The banking system in the Roman Empire consisted of private lenders (even military campaigns sometimes/often got called off due to financing trouble) and a few houses down the street, the home of one of those private bankers was found to contain fragments of the lending records. The Vettii owed him money. :^D