Bottom line is, if he can't PROVE it was rebut you must do so for two reasons. 07 had ceramic washers and at 100 hrs they need rebuilt.
Gauges do fail. You can have the dealer read the MPEM to see what it says, but I would just assume there is at least 100 hrs on it.
I STRONGLY suggest the check ride and taking a compression test as the hours can't be proven.
To test compression remove the plugs, ground the spark wires, thread in the tester, hold throttle wide open and crank the engine.
Post the results.