Models Y and 3 are going through updates/upgrades.
Please don't assume that your vehicle will have a particular hardware configuration based on a VIN or a date of production.
Production date is not based on VIN to discourage tracking the number of vehicles built per QTR.
Vehicles built on the same day could have different hardware configurations.
The only way to be certain is to inspect the car first-hand yourself.
Finally, there are no reports/evidence that Model Ys come with Dual-Glazed (Laminated) Rear windows at this time.