Unfortunately, the "zip code" search for used vehicles on the Tesla site is pretty meaningless now since Tesla removed the location attribute from all used cars.
Looking at the JSON data returned in any used car search, none of the records have a location attribute assigned, and even the NearByDeliveryRegion value is not set (it's usually set to a few state abbreviations of nearby states). Also, for used cars, the "Search within x miles" field disappears. So whatever cars they might be showing aren't necessarily cars near the zip code entered.
But they are happen to inform you that for any used car: