Sorry, but this is not necessarily correct.
The criteria get unlimited, transferrable supercharging is:
- Car had to be ordered by Jan 15, 2017
- Car had to be delivered prior to April 2017.
Both of those criteria have to be met. This says that there can be two cars, manufactured on the same day in 1Q 2017, but one has FUSC and the other does not based upon it being ordered before or after the cut-off date.
Also, Tesla did not necessary manufacturer cars in the same sequence they were ordered. They tended to chase maximizing deliveries by the end of the quarter, so cars for export tended to be built in first of the quarter, those requiring shipping across the US maybe more middle of the quarter, and those being delivered on west coast with very little shipping lead-time produced nearer the end of the quarter. This further complicates the timeline of when a car was delivered maybe not necessarily telling you anything about when it was ordered.
I wish it was easier for a buyer to be able to confirm if a car has transferrable free supercharging, but unfortunately, Tesla has made that actually quite difficult, pulling the direct indication of this from the owners accounts a couple years ago. I know that first had being someone that has a mid-2016 with transferrable free supercharging and no longer seeing that indicated in my on-line account (short of hacking the html codes embedded behind the displayed graphic).