After posting my case on several travel forums, I received some good feedback, and I have some further information to add:
1) The photos provided by Hertz Italy, have no date stamp, so Hertz Italy is unable prove when they were taken.
2) The initial paperwork provided by Hertz shows 6,246 kilometers on the car’s odometer on 17 May 2016 . The photo provided by Hertz Italy, shows 8,656 kilometers on the odometer, that is purportedly on 02 Jun 2016. The difference is 2,410 kilometers, that we are assumed to have drive from 17 May 2015, to 02 Jun 2015.
a. We made one round trip from VCE, to Fanna, Italy, per Google maps and using the way we went it is 240 kilometers round trip.
b. We made one day trip to Venice, and parked in the main parking garage next to the people mover, per Google maps and the way we went it is 254 kilometers round trip.
c. The casa de reposa that my father-in-law lives in is approximately 2 kilometers from his house, and I’m assuming a bit of driving around in Fanna, which per Wikipedia has a population of 1,574 people, meaning we didn’t drive far. So I’m estimating 10 kilometers per day, times 12 days (first and last days are not counted, as they are travel days and included in the round trip, to and from VCE) for a total of 120 kilometers.
d. We like to drive to the Citta Feira Mall in Udine, as they have a very nice grocery store and Wi-Fi. We usually go every other day, as we like to get our e-mail, and download newspapers, not to mention buy groceries. Per Google maps it is an 84 kilometer roundtrip. Six roundtrips to the mall times 84 kilometers, equals 504 kilometers.
e. The sum total of 240 kilometers, 254 kilometers, 120 kilometers, and 504 kilometers = 1,118 kilometers.
f. The difference in my driving estimate, and the amount of driving shown by the evidence provided by Hertz Italy, is a dramatic 1,292 kilometers!!!
g. The difference is so great that even if I forgot a few minor trips, as it has been 15 months, there is no way to account for 1,292 kilometers other than to conclude that someone else drove the car, after we returned it to Hertz Italy at VCE.
3) We paid for three different line items of insurance coverage:
a. Collision Damage Waiver = 99.16 Euros
b. Theft Protection = 82.82 Euros
c. Personal Insurance = 42.00 Euros
Total Cost for Insurance = 223.98 Euros
Using an exchange rate of $1.15, the total cost in Dollars we paid for insurance =$257.58.
Leading me to ask, what does the insurance actually cover!!!