This web site use to be the go to place to look for used teslas. Not sure how accurate it is today but you may find something there.
When I was looking for my used Model 3 on tesla web site, I would use a CA zip code. I did locate what I was looking for. The only drawback was the $2,500 additional shipping charge, but I got what I was looking for.
Last thing. I find that a new purchase with Tesla's lower pricing is not far from the used market. You can always contact a tesla advisor at a show room or on line and ask them to help look for what you want. Best of luck and take your time. Sorry to hear about the possible scams. I was there in 2016 and found myself in the same boat. Picked up a new 2017 75 model S better car and better price than a used P85 that I was looking at, with dealer. Even put a deposit on the used only to find out later it was salvaged by Tesla. That all would have been bad.