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As far as I know people have only now spotted any coming with them. Both spoiler and dual motor badge are IOU from Tesla. If/when available owners can ask to have them installed. Some don't want them (the badge in particular)
Would be foolish not to. The free supercharging is neither worth $5k, nor does it transfer with the vehicle anymore. Anybody selling a used model 3 with free supercharging is either lying or misinformed, it would be disabled once car transfers to you.
Everything that I have seen says I can claim the credit. Its vaguely described as cannot be purchased for purpose of resale, which it was not.The California credit is the one you need to own it for a set period of time, but I am income disqualified for that anyhow.
I had multiple people waiting to see if buyer fell through: sorry its gone. bank balance shows $0 this morning and truck showed up an hour ago to take the car.