It seems relatively consistent with other data we had. So this common_reservation_id is probably accounting for all reservations made with Tesla, including all models and CPO and maybe showroom cars that were sold to people. As long as people placed a reservation for any main products Tesla sells (may be not Tesla Energy?), the number will go up by 1.In-store, East Coast, about 2:30pm on March 31st - 386xx.
Reserved a CPO Model S on May 13th. Source code per FallenOne's request:
<input class="CountryCode" type="hidden" name="common_country_code" value="US" />
<input class="ModelCode" type="hidden" name="common_model_code" value="ms" />
<input class="ModelName" type="hidden" name="common_model_name" value="Model S" />
<input class="ConfigId" type="hidden" name="common_config_id" value="11387xxx" />
<input class="Region" type="hidden" name="common_region" value="NA" />
<input class="Uid" type="hidden" name="common_uid" value="9287xxxx" />
<input class="ReservationId" type="hidden" name="common_reservation_id" value="748xxx" />
Not sure if this helps.....
Note: Tesla China is using a totally different system and not accounted for in this one, it starts with 150 and it's an 8 digit number, but by my calculation, it's about 7% of the total.