Here is the update I got from speaking with couple of customer care agents and they both provided same answers ..
SR MY 7 seater option - they have very limited produced from the factory before it got discontinued and that too with standard color options such as White and Black mostly. The ones who are getting a VIN matches are mostly from this standard config build. For my options, such as MSM and 20 inch wheels, it is likely there will be a VIN match - he also checked with his internal tool (they call soft match tool). He said Tesla is working on an updated version of SR to improve the range and that may be launched in next quarter (by June) and that is what his management has updated internally this morning - again, going by Tesla this may get changed and they will confirm this by month end.
In my case, I can keep my order but there will not be any match found until an updated version of SR (if) is launched, if that is not the case, i will be notified by end of this month to either cancel or change my order to the ones that is available.
I don't know how much of it is true but based on other forums and FB posts, this is likely the case.