Mine had 111 miles on it when delivered. The VehicleLogs show a 2-hour trip for 60 miles in its early history, then storage. I was told by the sales staff that Tesla Motors wants to "thoroughly test" every car because this is such new technology, but that would not be consistent with delivering the Signature 100 with low miles ("untested") and then start testing more thoroughly after they've delivered thousands of them. I suspect it's just that the "on spec" cars get used for errands and such because they're available.
Anyway, my point is that this Silver 2010 Roadster 2.5 may never have been driven by an owner. The variation in odometer readings on freshly delivered Roadsters varies too much to say. The VehicleLogs would probably tell the story, provided you can find the date when the car transitioned from Tesla Motors to its first owner.