Possible error on Model S CPO website: missing Parking Sensors?

I've been browsing the CPO car listings and have noticed that for the San Francisco area, out of 25 cars listed only one is shown as having Parking Sensors. Then I checked the five most expensive CPO cars shown for the Los Angeles area and none of them are shown as having the Parking Sensors option.

That seems highly unlikely. I suspect a glitch in the software backend that runs CPO database driving those listings.

Also, the location filter drop down menu does not "maintain state" when you return to the main Pre-owned page after viewing an individual listing. In my browsers the San Francisco area comes up by default. If I select a different area and then view an individual car page in that area, and then hit the back button in my browser it goes back to the San Francisco area. This makes viewing individual cars in other areas rather tedious.

And the location filter drop down menu needs an "All regions" choice.

I ordered my S in mid-October 2013 and Parking Sensors were available. My father ordered his S in mid-September 2013 and got Parking Sensors. According to the wiki at Model S options by year - a running history - Tesla Motors Club - Enthusiasts & Owners Forum
Parking sensors, front and rear were added as a Design Studio option in August 2013.""

That said, I take the point made upthread that cars below about VIN 29,000 could not have Parking Sensors. And in fact, on the CPO page for San Francisco area cars there only three with VINs higher than that number. One of the three has Parking Sensors.

That said, on the Los Angeles area CPO page, for the five cars listed with VINs above 29,000 none of them are shown as having Parking Sensors. That seems odd to me. They are heavily optioned cars.