Tesla will likely never disclose the exact number (they will be reported in sum with models X and S). How will you resolve the question? "We know clearly" might be tricky in case of a close result.

People are tracking VIN numbers, but who's numbers are you going to use?

I'd suggest this guy: https://twitter.com/TroyTeslike

@Prin seems reasonable. If it's close there will be time for commenters to submit evidence